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!!! Saving History From The Dumpster!

These pages are dedicated to preserving a historical record of broadcast equipment. Others are doing an excellent job in recording other aspects of the history of broadcasting. As we find them, we'll add links to them. This site consists of scanned manuals and catalogs of broadcast equipment. This page [started in 2002|https://web.archive.org/web/20020205095757/http://www.hallikainen.org/history/equipment/].In October 2005, the site was changed from hand coded HTML to a wiki. In June 2014, this was migrated to a new server and an updated wiki code set. In September 2015, the wiki was again moved to another server (a virtual private server at 1&1 running Centos). Because of severe issues with wiki spam, only registered users can edit the pages.  Unfortunately, I have not figured out how to add authenticated users, so please contact me regarding page edits or adding scans. Further, to prevent wiki spam through the calendar and other means, writes to the page_data are disabled unless I am making edits. You will see PHP error messages due to this, but the wiki should be fully readable. If you have a scan you'd like posted, please [mail it to me|mailto:harold@hallikainen.org], and I'll post it.

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! Broadcast Equipment Manuals
* [Accurate Sound Corporation] - Supplier of tape recording equipment from various manufacturers.
* [Advanced Research & Technology]
* [Altec]
* [Amalgamated Wireless (Australiasia) Ltd.] (AWA)- Formed from Marconi and Telefunken interests before the First World War to resolve patent difficulties. Partly government owned, it provided Australia's coastal wireless services and overseas radio links. AWA had close links to RCA & Britsh Marconi. A lot of its domestic and professional products were closely patterned on RCA designs.
* [American Data] division of Airpax Electronics
* [American Electronic Laboratories] (AEL) - Transmitter manufacturer in the 1970s.
* AmperexElectronicCorporation - Manufacuter of vacuum tubes
* [Ampex] manufactured audio and video tape recorders.
* [Amperite] time delay relays
* [Anton Electronic Laboratories] - Supplier of radiological monitors for civil defense. Broadcast stations ended up with these in their government supplied fallout shelters.
* [Aphex Systems Limited]
* [Andrew Corporation]
* [Arrakis Systems, Inc]
* [Audio Arts]
* [ATI] - Audio Technolgies Incorporated
* [Auditron|Upload:AudioTron.pdf] - Flyer for the ~AudioTron vacuum tube. About 1915-1916.
* [Auditronics]
* [Autogram]
* [Bauer Electronics Corporation]
* [Belar Electronics Laboratory] - Modulation monitors. http://www.belar.com
* [Bell Telephone Laboratories]
* [Bext]
* [Bird Electronic Corporation] - RF wattmeters, etc.
* [Bosch] - Robert Bosch Corporation, Video Equipment Division
* [Broadcast Audio]
* [Broadcast Electronics]
* [Broadcast Television Systems]
* [Broadcast Tools]
* [Burk Technology]
* [Byer Industries] - Australian post WWII manufacturer of tape and disc recording and replay equipment.
* [California Microwave|Microwave Radio Corporation]
* [CBS Labs]
* [CCA]
* [Circuit Research Laboratories]
* [Coastcom]
* [Clear-Com]
* [Collins Radio], including Rockwell Collins
* [Comtech Antenna Corporation]
* [Continental Electronics]
* [Consolidated Electronic Industries] - (CEI) Australian Open Reel and Cartridge Tape Machine manufacturer
* [Crown] - Audio amplifiers, crossovers, etc.
* [CSI]
* [Cutting Edge Technologies]
* [Dana Electronics]
* [Data Systems Design]
* [Dayton Industrial]
* [dbx]
* DeltaElectronics - Manufacturer of broadcast test and other broadcast equipment
* [Dolby Laboratories]
* [Dorrough Electronics] - http://www.dorrough.com, audio processors, loudness meters.
* [Dumont]
* [Eimac|EimacDivisionOfVarian] - Manufacturer of high power vacuum tubes
* [Electronics Research, Inc.] - FM antennae
* [Energy-Onix] - Tramsmitters
* [Engineering Services] - FM antennae
* [ESE]
* [Federated Purchaser] - Catalogue from a Wholesale house supplying independant Radio Repair Businesses. 1936 catalogue.
* [Fidelipac] - Audio tape cartridges and machines
* [Frese and Kaping] - The Audio Pilot
* GatesAir - Broadcast transmitters. See [~GatesAir web site|https://www.gatesair.com/], GatesRadioCompany, and [Harris Corporation - Broadcast Division]
* GatesRadioCompany - Manufacturer of broadcast equipment. See also [Harris Corporation |http://www.broadcast.harris.com] and GatesAir
* GeneralElectric
* GeneralRadio - Manufacturer of test equipment
* [Gentner]
* [Gorman-Redlich]
* [Hallicrafters]
* [Hallikainen And Friends|HallikainenAndFriends] - Manufacturer of audio and telemetry equipment
* [Harman Kardon]
* [Harris Corporation - Broadcast Division] - See also GatesRadioCompany and http://www.broadcast.harris.com .
* [Heathkit]
* [Hewlett Packard]
* [Hollyanne]
* [Howe Technology|HoweTech]
* [Hughey & Phillips]
* [IGM] - Program automation
* [Inovonics]
* [IRC] - Passive components
* [ITA]
* [ITC] - International Tapetronics Corp - Cartridge Recorder/Players
* [Jampro Antenna]
* [E F Johnson|EfJohnson]
* [Kenwood]
* [Kyocera]
* [Langevin]
* [Larcan] including TTC
* [LPB]
* [Magnecord]
* [Machlett Laboratories] - Manufacturer of vacuum tubes
* [Marconi Wireless Telegraph Company]
* [Marantz]
* [Marti Electronics, Inc.] - RPU, STL, and remote control
* [McIntosh] Audio power amplifiers
* McMartin
* [Microcon] - FM Composite Stereo Processor
* [Microwave Radio Corporation]
* [Modulation Sciences]
* MoseleyAssociatesInc - Manufacturer of remote control, STL, TRL, and other broadcast equipment. See http://www.moseleysb.com/mb/
* [Motorola]
* [Moulic Specialties Co.] - Tape cartridge machines. Appears to be predecessor to [Sonomag Corporation]
* [Mullard] - Manufacturer of electronic valves
* [Multronics] - high power inductors and RF contactors
* [National] - Manufacturer of receivers
* [NBC] - NBC designed some of its own equipment. A small collection is detailed here.
* NemsClarke - Manufacturer of field strength meters and antenna monitors
* [Neotek] audio consoles
* [Orban]
* [Otari] magnetic tape recorders
* [Pacific Recorders and Engineers]
* [Panasonic]
* [Philips]
* [Potomac Instruments]
* [Presto] disk recording equipment
* [Pultec]
* [QEI]
* [Radio Engineering Laboratories]
* [Radix]
* [RAMSA|Panasonic]
* [Raytheon]
* [Revox]
* [RCA]
* [Rust Industrial Company, Inc.]
* [Scala] antennae
* [Schafer Automation]
* [Scully] Audio tape equipment
* [SMC] or Sonomag Corporation - Program automation
* [Sparta Electronics]
* [Standard Electronics] division of [Radio Engineering Laboratories]
* [Standart Tape Laboratory] - Audio alignment tapes
* [Standard Telephones & Cables. Australia]
* [Studer]
* [Sony]
* [Straight Wire Audio]
* [ Studer International AG]
* [Symmetrix]
* [Taber Manufacturing and Engineering Company] - Audio tape head design, manufacture, service. See also [Standard Tape Laboratory]
* [Tapecaster]
* [Teac]
* [Technics] (Panasonic)
* [Tektronix]
* [Teletronix Engineering Company]
* [Telfax] Phone remote mixers also sold by Marti and BE
* [Tentel]
* [Tepco] FM translators
* [Texar] division of [Gentner]
* [TFT, Inc.] (Time & Frequency Technology, Inc.) - Frequency and modulation monitors, remote control, EAS.
* [Thompson-CSF]
* [TTC|Larcan]
* [3M]
* [Trimax] division of L M Ericsson Pty Ltd (Australia) - Manufacturer of transformers.
* [United Transformer Corporation]
* [UREI]
* [Victoreen Instrument Company] - Supplier of radiological monitors for civil defense. Broadcast stations ended up with these in their government supplied fallout shelters.
* [Warehouse Sound|Upload:harold/WarehouseSound.pdf] Professional Products Group catalog. Warehouse Sound was based here in San Luis Obispo. They were located in an old railroad warehouse ("Railroad Square") and sold mail order home stereo equipment (and professional products). They were quite successful during the days of Fair Trade laws, where manufacturers were allowed to set the retail prices of their products. These were generally state laws and did not apply to interstate sales, which many mail order sales were. Warehouse Sound was sold a little before the disappearance of the Fair Trade Laws. This is the 1974 Professional Products catalog. It runs 610MB, so be patient! Another catalog is available [here|https://imgur.com/r/audiophile/xN3FY].
  * Cliff Branch, one of the founders of Warehouse Sound, writes about it [here|http://americanmadestory.com/03_no_fear_of_failure/index.html]
  * [Rolling Stone Article on Warehouse Sound|http://www.rollingstone.com/music/features/how-to-get-hi-fied-a-hundred-miles-from-nowhere-19770908]
* WesternElectric and the Bell System Journals because they relate to broadcasting 1922-1983 and the history of communications.  SBA
* [Westinghouse]
* [Wheatstone Corporation]

! [Historic Papers]
Papers by the people who made broadcasting possible. A collection of papers on technology. Quite a few early papers on AM, FM, and TV.

! [Photo Gallery|http://bh.hallikainen.org/gallery/]
Contributed photos of historic equipment and installations.

! [Station Histories]
Contributed station histories and links to others.

! Other Manual Archives
* [American Radio History|http://www.americanradiohistory.com/Equipment_Catalogs_Master_Page.htm] - Extensive collection of catalogs an manuals back to 1933.
* [Audio Sharing|http://www.audiosharing.com/archive/archive.htm] - An archive of audio equipment manuals including some used in broadcast and film.
* [Australian Professional Audio Equipment|http://www.oneillassociates.com.au/~poneill/] - Originally the purpose of this page is to document professional audio recording devices manufactured in Australia. The main focus is on professional reel to reel magnetic tape recorders but other recording devices such as tape cartridge machines, magnetic drum recorders, disc cutting and replay equipment are also covered. The collection inclues equipment, manuals, advertising material and accessories including mic preamps, line amps, mixers, power amps, limiters, volume indicators, program failure alarms, etc. The two criteria for inclusion are that the equipment was made in Australia and that it was used in the recording or broadcasting industry or was used in a commercial setting such as a lift announcement unit.
* [BAMA|http://bama.sbc.edu/index.html] - Boat Anchor Manual Archive
* [BAMA Mirror|http://bama.edebris.com/]
* [BAMA List of Other Sites|http://bama.sbc.edu/free.htm] with free manuals
* [AA4DF|http://www.aa4df.net] manuals for sale with some [free|http://home.comcast.net/~aa4df02/download.htm]. Manuals for consumer, broadcast, communications, and test equipment.
* [AC6V List|http://ac6v.com/manuals.htm] of ham radio manual suppliers
* [Broadcast Documents|http://www.broadcastdocuments.com/] - collection of manual photocopies for sale
* http://www.coutant.org/ - Extensive microphone archive and several other pieces of equipment.
* [DIY Audio|http://www.pmillett.com/technical_books_online.htm] Technical Books Online. Extensive collection of tube manuals and books on design and troubleshooting.
* [Electron Ballet|http://www.electronballet.com/] - Computer and test equipment manuals and more.
* [KO4BB|http://www.ko4bb.com/getsimple/index.php?id=manuals] - Large collection of test equipment manuals and application notes. Some broadcast manuals.
* [Library of Congress Vintage Manuals, Brochures, Catalogs, & Reports|https://www.loc.gov/programs/national-recording-preservation-plan/tools-and-resources/vintage-manuals-brochures-catalogs-and-reports/] - Extensive manual collection and history of recorded sound
* [Nostalgia Air|http://www.nostalgiaair.org/Resources/] - Antique and vintage radio info
* nvhrbiblio.nl - Amazing collection of early books, magazines, and schematics
  * [Books|https://nvhrbiblio.nl/biblio/boek/]
  * [Magazines|https://nvhrbiblio.nl/biblio/tijdschrift/]
  * [Schematics|https://nvhrbiblio.nl/schema/]
* [Purple Audio Schematic Library|http://www.purpleaudio.com/resource/pdflib.html] - Schematics and manuals for Altec, Ampex, CBS Labs, Datamix, Gates, Langevin, Pultec, RCA, Spectra Sonics, Sony, Telefunken, 3M, UREI
* [eService Info|http://www.eserviceinfo.com] - Service manuals for computers, test equipment, consumer equipment in rar format
* http://www.ebaman.com/ - Various contributed manuals for electronics, computers, home electronics, motors, etc.
* [Liberated Manuals|http://www.liberatedmanuals.com/] - Extensive collection of military manuals.
* [PDF Manuals|http://www.pdf-manuals.com/] - Tektronix test equipment manuals for sale.
* [One Electron Archive|http://www.one-electron.com/Archives.html] - Extensive collection of manuals and vacuum tube data.
* [Radio Era|http://www.radioera.com/shop/category.aspx?catid=2] - Over 150,000 original factory instruction and service manuals from 1915 - 1985
* [Radio Gear Guide|http://www.radiogearguide.com/] - Links to manufacturer provided manual pages.
* [Radio Papers|http://www.radiopapers.net/] - Manuals and papers from broadcast equipment manufacturers and consultants.
* [Rider's Perpetual Troubleshooters|http://hertzmail.com/Riders-vols/] - Receiver schematics and service info for 1920s through 1954.
* [SafeManuals|http://safemanuals.com/] - Consumer product manuals.
* [A. G. Tannenbaum|https://www.slimandtone.com/] - Manuals for sale
* [Star City Radio Tools|http://plymouthcolony.net/starcityeng/pages/manuals.html] - Manuals scanned by Dale Cook. He has also provided several manuals for this site. He does a great job cleaning up the images.
* [Steam Powered Radio|http://www.steampoweredradio.com/index.html] - There are eight sections of interest. The "Radio Stations", "Manuals", and "Catalogs" sections all pretty much deal with radio (sometimes TV) broadcasting items. "Collections" contains pages for individuals who have contributed large amounts of material. "Audio" contains some interesting audio clips collected over the years. "Components" is a collection of parts catalogs, data sheets and manuals of older items you might run across but can't find data onThe "Other Stuff" section is a collection of items I find of interest. This includes old magazines, catalogs, ham radio stuff, railroading or anything else that strikes my fancy. The "People" section is about, well, some of the people who have contributed to the site.
* [Technician's File Cabinet|http://www.one-electron.com/filing_cab.html] - Attempt to bring together in one place links to service and technical information for electronic equipment. Includes sections for consumer audio, pro audio, old radios, ham radio, test equipment, military electronics, and transformers.
* [Telephony Document Archive|http://sc.infc.info/] - Extensive telephone system documentation collected by Steve Cichorsky.
* [Teletype Manuals|http://hertzmail.com/TTY/] and other info related to Teletype teleprinters.
* [Teletype Model 35 ASR|https://www.blunham.com/Misc/ASR35/index.html]
* [Transcom Corporation|http://www.fmamtv.com] has manuals for sale. Manuals include [transmitters|http://www.fmamtv.com/mantransmitters.html] and [exciters|http://www.fmamtv.com/manexciters.html]
* [Northland Radio|http://www.lks.net/~radio/Pages/manuals.htm] has quite a few manuals with copies available for sale and a few free for download
* [Tube Books|http://tubebooks.org/] - Collection of vintage engineering texts, vacuum tube datasheets, and other obsolete information. Has an extensive collection of text books on vacuum tube electronics.
* [Vintage Manuals|http://www.vintagemanuals.com/] - over 16,000 vintage radio, audio and test equipment manuals.
* [Waltzing Bear Schematic Archive|http://www.waltzingbear.com/Schematics/Schematics.html] - Schematics and data for AKG, Altec, Ampex, API, CBS, Dolby, Gates, Jensen, MCI, Neve, Orban, Otari, Pacific Recorders and Engineering,  Quad Eight, RCA, Sennheiser, Shure, ~SpectraSonics, Spectrum, SSL, Studer, Telefunken, Trident, Urei, UTC, Valley, Western Electric, and others.

! Other Broadcast History Sites
* [American Radio History|http://www.americanradiohistory.com] - Extensive archive of broadcast publications, including Broadcasting Magazine, Broadcasting Yearbook, Radio Daily, RCA Broadcast News, and more.
* http://antiqueradios.com/resources/
  * http://antiqueradios.com/resources/Radio_History/
  * http://www.antiqueradios.com/resources/
  * http://www.antiqueradios.com/superhet/ - Who invented the superhet?
  * http://www.antiqueradios.com/archive.shtml - Magazine, manuals, and more!
* Audio Processing History
  * [Audio Processing: A Perspective|http://www.omniaaudio.com/tech/retrospective.htm] - Frank Foti describes the history of audio processing for broadcast.
  * [A Short History of Transmission Audio Processing in the United States|http://www.bext.com/histproc.htm] by Robert Orban
* http://www.amfone.net - Restore and put that old broadcast transmitter to work as an amateur radio transmitter!
* http://www.broadcastpioneers.com of Philadelphia - invaluable...a trove of early TV memories for Delaware Valley nostalgiaholics.
* [David Gleason|http://www.davidgleason.com/Radio_Archives.htm] has a very nice collection of Broadcasting Magazines (1935-1949) and Broadcasting Yearbook (1944-1979).
* [Early Radio History|http://earlyradiohistory.us] - Thomas H. White's _very_ extensive site covering 1897 through 1927
* [California Historical Radio Society|http://www.californiahistoricalradio.com] exchanges ideas and information on the history of radio, particularly in the West, with emphasis in collecting, literature, programs, and the restoration and display of early equipment.
* [Chalk Hill Educational Media|http://www.chalkhillmedia.org/Museum/index.htm] has a nice collection of historic radio and television info.
* http://www.coutant.org/ LOTS of information on LOTS of microphones. Also, some manuals on old broadcast equipment.
* [Drake Chenault|http://www.drakechenault.org]
* Donna Halper's History of Broadcasting [Links|http://www.donnahalper.com/History.html] - includes The Story of Jewish Comedians in America, The Short Course by Donna Halper, Donna Halper and The Rush Discovery Story, Halper's History of Radio - Old Time Radio, African Americans and Early Radio by Donna Halper, Milestones of the Radio Age, Radio in 1939 - Halper's History of Radio - Old Time Radio, Broadcasting History Articles by Elizabeth ~McLeod, John Sheppard III, Some History by Donna Halper, A Radio First in Vinton Iowa by Donna Halper, Rembering the Ladies, A Salute to the Women of Early Radio.
* [Early Radio|http://www.durenberger.com/resources/ER.htm] - Extensive collection of documents at http://www.durenberger.com/ .
* [Edwin Howard Armstrong|http://www.fathom.com/course/10701020/sessions.html] - FM Inventor - History at Columbia University.
* [Armmstrong Archive Blog|https://blogs.cul.columbia.edu/armstrongpapers/] - Columbia University is catalogging Armstrong's papers. Ideally they'll scan them andmake them available. Meanwhile, tidbits are available here.
* [FCC Audio Division Collected Engineering Documents|http://www.fcc.gov/mb/audio/decdoc/engrser.html] contains an extensive collection of documents showing the history of radio broadcasting. These include documents on early AM and FM broadcasting, and the Radio Service Bulletins from 1915.
* [FCC Radio Pioneers|http://www.fcc.gov/omd/history/radio/] - The Ideas that Made Radio Possible, The Power that Made Radio Realistic,     The Quality that Made Radio Popular
* [FM Broadcasting Chronology|http://jeff560.tripod.com/chronofm.html] - This page shows some of the events in the early history of FM broadcasting in the United States. Note that apex stations referred to on this page used amplitude modulation on VHF frequencies; many of them evolved into FM stations. For dates involving the earliest stations, see also the "earliest FM stations" page at this website.
* [Gates Harris History|http://gates-harris-history.com/] - Great archive of Gates newsletters back to 1935
* [Bob Groome SOB Site|http://www.bobgroome.us/BobGroome/Welcome.html] - Extensive schematic and photo collection.
* [History of American Broadcasting|http://jeff560.tripod.com/broadcasting.html]  by Jeff Miller. Many articles and an extensive list of links to other broadcast history sites.
* [Bob Mayben|http://www.bobmayben.com/] has a nice collection of photographs of older equipment, much of it restored to like new condition.
* [Modesto Radio Museum|http://www.modestoradiomuseum.org/] - The Modesto Radio Museum foundation was formed in 2004 comprised of current and past men and women with local broadcasting experience.   The original idea for the museum came in 2004, when Harry Pappas, owner of the original KTRB property on Norwegian Ave in Modesto,  contacted  Wes Page, Cecil Lynch and Cal Purviance with the idea to build a museum dedicated to preserving the history of commercial broadcasting in Modesto, and the area,  beginning in 1933 when KTRB signed on the air in Modesto.  The goal was to increase and preserve the knowledge, understanding and appreciation of their efforts and the equipment they used. Due to economic conditions, the museum is currently on the web only.
* [oldradio.com|http://www.oldradio.com] - Oldradio.com's mission is to find and share information about the pioneer broadcast radio stations and current industry issues, as well as links and references to other locations containing accurate materials on broadcasting. The emphasis is on professional broadcasting, but we can "wander" a bit from time to time. The goal is to shed light on your questions, and clear up some myths.
* [On The Air|http://www.youtube.com/watch?v=6VHtZr_xsT8] - 1937 film describing how radio works.
* http://hawkins.pair.com/radio.html - Jim Hawkins Radio and Broadcast Technology Page. Photo tours and histories of many statons.
* [Radio Lovers|http://www.radiolovers.com/] - audio archives of old radio programming.
* [Old Time Radio Catalog|http://otrcat.com/] - EXTENSIVE catalog of old radio broadcast recordings for sale.
* http://www.marconicalling.com/ - The Guglielmo Marconi archive including MANY historic documents, such as his early patents, Titanic communications, and MUCH more!
* http://www.radioclubofamerica.org
  * http://www.radioclubofamerica.org/publications.php?page=books.html - Books including one on Armstrong and one on ~DeForest
* http://www.radioheritage.net - We're sharing the stories of Pacific radio. More than anywhere else in the world, radio found an easy home here, conquering vast distances of ocean, and connecting the scattered islands with each other in much the same way early Polynesian seafarers used the sea itself as their main means of communication.
* [UK Radio and TV Transmitters|http://tx.mb21.co.uk/]
* [IEEE Oral History Site|http://www.ieee.org/organizations/history_center/oral_histories.html] - Interviews with those involved in the development of radio, television, radar, the internet, etc.
* [The EBS Accident|http://stlradio.net/pages/ebsaccident.htm] - In 1971, the wire services carried an Emergency Action Notification requiring normal broadcasting to cease immediately...
* [GGN Information|http://www.ggninfo.com] - Early commercial FM and Television broadcasting facilities from mid 1930s to late 1970s. Concentrates on New Hampshire, major stations in New England and the Northeast, as well as other selected early broadcasters.
* [Radio Links|http://www.radiolinks.net/History/] - LOTS of links to broadcast oriented sites. The history page links to several dozen broadcast history sites.
* [Reel Radio|http://www.reelradio.com] Top 40 Radio Repository air check collection.
* [The Roots of Radio run deep in Philadelphia|http://beradio.com/features/radio_roots_radio_run/] - Tells the evoloution of several broadcast manufacturers, including RCA, GE, CCA, ITA, Ampex, Comark, Belar, AEL, QEI, CSI, LPB, Wilkinson, ATI, Dielectric, Ampro,
* John Schneider's [San Francisco Radio History|http://users.adams.net/~jfs/] - Very nice collection of station histories.
* [Snugglebunny|http://www.snugglebunny.us/] page by Alan & Sharon Kline. Includes radio magazines from the 1920s forward, links to camera tube datasheets, links to historic broadcast patents, etc.
* [The Radio Historian|http://www.theradiohistorian.org/index.htm] - John Schneider's extensive collection of documents. This web site was created to be a non-commercial repository of historical information and photos documenting the early years of radio broadcasting in the United States.  A substantial portion of the site is dedicated to the history of broadcasting in the San Francisco Bay Area.
* Video Park [Restoration of Old Broadcast Equipment|http://www.videopark.com/oldbroadcast.htm] - Photographs of very nicely restored broadcast equipment
* [Western Historic Radio Museum|http://www.radioblvd.com] - Vintage Radio Equipment and Memorabilia, 1910 through the 1950s, Virginia City, Nevada
* [Vintage Broadcast Microphones|http://www.k-bay106.com/mics.htm] - Private collection of early broadcast microphones, related documentation and collector/historian resources.
* Video - Found video about radio
  * [NBC Presents “Behind Your Radio Dial” (1940)|https://www.youtube.com/watch?v=5K0fimMtyt8] - Describes various aspects of electronics including broadcast radio and television, manufacturing, receiver repair, public address, and maritime communications. Concentrates on the training required and job opportunities.
  * [How Radio Broadcasting Works (1937)|https://www.youtube.com/watch?v=RfQOSb39gqg] - Describes a bit of the technology involved in getting sound from the studio to your radio. One interesting image is how amplification works. They show the image of a waveform, then show it amplified. But, the amplified waveform appears to be just an enlarged image of the original, in both the X and Y axis. So, the amplification appears to make the amplitude larger and the frequency lower.

! Television
* [Antique Television|http://www.telecompricer.com/article/Antique-Televisions.html] - a brief page, but has several links that look good.
* [The Old CATV Equipment Museum|http://theoldcatvequipmentmuseum.blogspot.com/] - A place to post photos of ancient cable TV equipment, with appropriate captions.
* [Cartrivision|http://www.angelfire.com/alt/cartrivision/] - The first consumer videocasette machine in 1972.
* [Chalk Hill Educational Media|http://www.chalkhillmedia.org/Museum/index.htm] has a nice collection of historic radio and television info.
* [DuMont Television Network|http://members.aol.com/cingram/television/dumont.htm] - In the late 1940's and early 1950's, ~DuMont was America's fourth television network.
* [Early Television Foundation & Museum|http://www.earlytelevision.org/] in Ohio. Site has nice images of televisions back to 1928. Has images from a Baird mechanical receiver. Lotsa stuff!
* [Farnovision|http://www.farnovision.com/] - Philo T. Farnsworth, inventor of television
* [FCC|http://www.fcc.gov/omd/history/tv/] Television History pages.
* [History of UHF Television|http://historysdumpster.blogspot.com/2014/03/the-history-of-uhf-tv.html] - Excellent collection of artifacts from [Histor's Dumpster|http://historysdumpster.blogspot.com/]
* [Jonz Valve Page|http://www.thevalvepage.com/] - Extensive photo galleries and restoration info for old radios and televisions.
* [~LabGuy's World|http://www.labguysworld.com/] - EXTENSIVE collection of consumer video tape recorders with excellent links to other video sites.
* [Living Test Patterns: The Models Who Calibrated Color TV|http://www.theatlantic.com/technology/archive/2015/06/miss-color-tv/396266/] - The white women known in the 1950s as “Miss Color TV” reinforced longstanding hierarchies of gender and race that were built into generations of technologies. The article also details the battle between CBS and RCA for the color television standard.
* [Narrow Band Television Association|http://www.nbtv.org/] - Early television, especially mechanically scanned.
* [North Beach Media|http://northbeachmedia.com/Production.html] has a nice collection of photos of vintage television equipment. Scroll down the page to the photo gallery, then select a "vintage" area in the drop down menu.
* [NTSC-TV|http://www.ntsc-tv.com/] has extensive technical information on the US analog television transmission system and its development.
* [Old Boys|http://www.vtoldboys.com/] The 'Oldboys' web site began in 1998 which was the 40th 'birthday' of videotape in the BBC, and so it seemed appropriate to commemorate this with a small collection of pictures from the various decades. Since then it has expanded somewhat to over 1500 pages and 2400 pictures and, in November 2008, we celebrated our tenth birthday.
* [Old CATV Equipment Museum|http://theoldcatvequipmentmuseum.org/] - Vast documentation from the beginnings of community antenna television.
* [Quadruplex Park|http://www.lionlamb.us/quadpark.html] - Quadruplex park is the home page for those who are interested in collecting electronic equipment used in broadcasting. It is especially for those who collect the more obscure, unusual, and sometimes just plain hard-to-deal-with things, such as large format VTR's, film chains, switchers, studio cameras, terminal equipment, and even transmitters.
* [Ed Reitan's Color Television History|http://novia.net/~ereitan/]
* [Television Tape|http://www.televisiontape.tv/] - Discover the magic of television production on tape, as compared to film.
* [historytv.net|http://www.historytv.net/] - Early television images, including 1929 broadcast of Felix the Cat
* Tech Notes [history|http://www.tech-notes.tv/History&Trivia/history_of.htm] and [biography|http://www.tech-notes.tv/Biographies/biographies_and_personal_notes.htm pages]. Television oriented including history of translators, TV channel 1, studio equipment, telecine, satellite, video recording, cable television, etc. Biographies include Klaus Landsberg, Harry Lubcke, John Logie Baird, Vladimir Kosma Zworykin, Paul Gottlieb Nipkow, Fondazione Guglielmo Marconi, and Charles Hallinan.
* [tvhistory.tv|http://www.tvhistory.tv] - The first 75 years of TV
* [Chuck Pharis Video|http://www.pharis-video.com/] - Chuck has an excellent collection of vintage television broadcast equipment... and radio too!
* [Videotape Systems Theory|http://www.lionlamb.us/quad/theory.html] - Has a nice history and photographs of the development of videotape.
* [W3XK -- America's first television station|http://online.sfsu.edu/~hl/cfj/cfj.W3XK.html] - A scrapbook of postcards, letters, and QSL cards collected by station owner, Charles Francis Jenkins.

! Cinema
* [3-D Film Archive|http://www.3dfilmarchive.com/home] - Great film technology history site. Besides 3D, has documentation on wide screen, stereo sound, etc. Largely ads for movies featuring these technologies plus ads and articles on the technology.
* [Audio Engineering Society|http://www.aes.org/aeshc/docs/recording.technology.history/motionpicture1.html]
* [Backstage at the Fox 1929|http://backstagefox1929.blogspot.com/search/label/PART%20III%3A%20TALKING%20PICTURE%20PROJECTION] - Extensive information on early sound for motion pictures as found at the Atlanta Fox Theater with 4,462 seats.
* [New Technology in Cinema|Upload:harold/New Technology in Cinema.pdf] - Presentation by Harold Hallikainen to Retired Active Men on 6/16/15.

! Amateur Radio
* [Luxorion|http://www.astrosurf.com/luxorion/qsl-ham-history.htm] - Extensive history of amateur radio.
* [Ham Radio History|http://w2pa.net/HRH/] - Extensive history of amateur radio starting in 1886.

! Maritime Radio
* [American Marconi|http://www.american-marconi.org/] - The American Marconi Foundation is a non-profit education and research organization dedicated to the continuation of the work of Nikola Tesla, Oliver Heaviside, Proteus Steinmetz, Ernst Alexanderson and all the others that contributed to the advancement of electrical engineering. In particular, the study of electrical engineering with regards to the development of the New Brunswick and Bolinas radio frequency electrical substations and future technologies latent in their design.
  * [Wireless Giant of the Pacific|http://www.american-marconi.org/Downloads/assets/Livingston%20Pacific%20Wireless.pdf] - A History of the Marconi and RCA Radio Stations on the Point Reyes Peninsula
* [Inland Marine Radio History Archive|http://www.imradioha.org/index.htm] - Collecting, preserving and presenting the history of radio's use on the Great Lakes and Mississippi River system
* [Marine Radio Historical Society|http://www.radiomarine.org/] - Radiotelegraph ship to shore
* [Maritime Radio Stations of the World|http://coastradio.intco.biz/] - Nice collection of information on stations throughout the world. Numerous videos. Links to other maritime radio information (Radio Operators Association, etc.).
* http://www.marconicalling.com/ - The Guglielmo Marconi archive including MANY historic documents, such as his early patents, Titanic communications, and MUCH more!
* [Titanic Radio Page|http://www.hf.ro/] - Very nice site including photos and a transcript of Titanic's distress communications.

! MilitaryRadio
Descriptions of military radio equipment and networks.

! Museums
This section tries to identify technology museums you can actually visit.
* [California Historical Radio Society|https://www.californiahistoricalradio.com/], Alameda CA. The California Historical Radio Society (CHRS) is a non-profit educational organization founded in 1974 to promote the preservation, restoration, research and publication of early radio and broadcasting history. CHRS publishes an excellent journal.
* [Computer History Museum|http://www.computerhistory.org/], Mountain View, CA - preserves and presents for posterity the artifacts and stories of the information age. As such, the Museum plays a unique role in the history of the computing revolution and its worldwide impact on the human experience.
* [Early Television Foundation & Museum|http://www.earlytelevision.org/] in Ohio. Site has nice images of televisions back to 1928. Has images from a Baird mechanical receiver. Lotsa stuff!
* [JKL Museum of Telephony|http://jklmuseum.com/] - The American Museum of Telephony (AMoT), known familiarly as the JKL Museum, is dedicated to the preservation of all aspects of telephony.
* [Maritime Radio Historical Society|http://www.radiomarine.org/] - Morse radiotelegraph station. Transmitter site in Bolinas CA. Receive site in Pt. Reyes Station CA.

  From "Who We Are" - Let's be honest... We're a bunch of radio squirrels.  And very lucky radio squirrels at that.  We inherited the last remaining Morse code coast station in North America.  It was off the air but it was an intact time capsule.

  We made the restoration of KPH to operational status our life's work.  That was back in 1999 - the year the last commercial Morse code message in the U.S. was supposedly sent.

  Through the trust and vision of the Point Reyes National Seashore we were given permission to begin our project of restoration, documentation and operation.  And we've never looked back.

  As True Believers in the importance of our maritime radio heritage we have tried to research and document every aspect of the field.  Our area of specialization is the coast stations, ships and companies of the west coast of the United States. But anything to do with maritime radio anywhere in the world is of interest to us.

  Dedicated MRHS volunteers are busy with the preservation, restoration and repair of the historic artifacts with which we have been entrusted.  That work is the foundation on which the real goal of our project rests.  That goal is to assure that the culture, techniques and traditions of the men and women who came before us are not forgotten.  We feel that the best way to achieve that goal is through actual on the air operations.

  We look forward to visits by fellow True Believers in the importance of the preservation of our radio heritage.
* [Modesto Radio Museum|http://www.modestoradiomuseum.org/] - The Modesto Radio Museum foundation was formed in 2004 comprised of current and past men and women with local broadcasting experience. The original idea for the museum came in 2004, when Harry Pappas, owner of the original KTRB property on Norwegian Ave in Modesto, contacted Wes Page, Cecil Lynch and Cal Purviance with the idea to build a museum dedicated to preserving the history of commercial broadcasting in Modesto, and the area, beginning in 1933 when KTRB signed on the air in Modesto. The goal was to increase and preserve the knowledge, understanding and appreciation of their efforts and the equipment they used. Due to economic conditions, the museum is currently on the web only.
* [Museum of Magnetic Sound Recording|http://museumofmagneticsoundrecording.org/] - The mission of the nonprofit Museum of Magnetic Sound Recording is to create and maintain a public museum in Austin, Texas dedicated to the research, acquisition, restoration and preservation of vintage magnetic sound recording devices, their documentation and history, and to serve as an educational resource for those interested in the sound recording industry. Also at http://r2rtx.org/ .
* [National Museum of Computing|http://www.tnmoc.org/] (Milton Keynes, UK) is dedicated to showing the development of computing in its broadest sense from the pioneering war time efforts that resulted in Colossus, to the products and systems we use today. The museum is part of the whole Bletchley Park experience, and all visitors to the park can visit the museum free of charge when it is open. The museum houses the Colossus computer, an exhibition of the most complex code cracking activities performed at the Park, and enhances the Park visitors' experience by continuing the history of the development of computing from the 1940s to the present day.
* [Southwest Museum of Engineering, Communications and Computation|http://www.smecc.org/], Glendale AZ - A very extensive collection of physical and online resources.
* [Telecom History Group|http://www.telcomhistory.org/] proudly preserves and shares the rich heritage of an industry that has had and continues to have a huge impact on our society, our culture, and most of all, our ability to communicate. THG has museums in Denver CO and Seattle WA.
* [Texas Broadcast Museum|https://texasbroadcastmuseum.com/], Kilgore TX. When you visit the Texas Broadcast Museum in Kilgore, TX, you’ll be amazed at the vast amount of memorabilia and vintage equipment we’ve collected over a lifetime. From the TV cameras and televisions to the radio equipment and vintage microphones, plus much more, it’s a fun and nostalgic walk down memory lane. There’s even a working radio studio where you can get a feel for what it must have been like to be a disc jockey in the past.
* [Western Historic Radio Museum|http://www.radioblvd.com/] - Vintage Radio Equipment and Memorabilia, 1910 through the 1950s, Virginia City, Nevada

! #[Police Radio]
* [Early Motorola Land Mobile|http://www.mbay.net/~wb6nvh/Motadata.htm] - History of Motorola mobile radio equipment, largely used by police agencies. Includes links to pages on California Highway Patrol radio history.
* [Los Angeles Police Radio|https://web.archive.org/web/20150624074531/http://harrymarnell.net/kma367.htm] and [KGPL|https://web.archive.org/web/20150525052156/http://harrymarnell.net/elysian.htm], Elysian Park transmitter site (1931)
* [Broadcast News Number 1, October 1931.|Upload:RcaBroadcastNewsOct1931.pdf] - description of a police radio system. Original courtesy of Tom Friedman. 8.756M

! Recording (audio, video, etc.)
* [Wikipedia|https://en.wikipedia.org/wiki/Sound_recording_and_reproduction] article on sound recording.
* [Wikipedia|https://en.wikipedia.org/wiki/Video#Recording_formats_before_video_tape] notes on video recording.
* [Ampex Virtual Museum|http://recordist.com/ampex/] - Dedicated to preserving the history of the most important manufacturer of magnetic recorders, the Ampex Virtual Museum provides online access to Manuals, Schematics, and Service Bulletins; Repair, Maintenance, and Modification Tips; Parts and Repair Sources; Catalogs, Sales Brochures, and Similar Literature; Pictures of Ampexes (mostly); Biographies of some Ampex Mailing List subscribers; Pictures of Ampex Mailing List parties; Ampex history & Other Historical Information; Audio Clips of Interviews with Former Ampex Employees; Alignment Instructions; Links of Interest to Ampex Users; Obituaries; Illustrations Accompanying Dale Manquen's Posts on Flutter; Literature Scanning Project
* [Audio Engineering Society History Commitee|http://www.aes.org/aeshc/] - The AES Historical Committee is an international forum open to all who wish to investigate and learn about the achievements of those pioneers whose innovative ideas and inventions have contributed to audio's rich past. Dedicated to the preservation of over a century of audio history, the Committee is developing a broad-based history of audio engineering and the audio industry. AES membership is encouraged but not required.
* [Audio Engineering Society Oral History Project|http://www.aes.org/historical/store/oralhistory/] - Oral history DVDs available for sale.
* [Blattnerphone|https://en.wikipedia.org/wiki/Ludwig_Blattner] - Adaptation of the wire recorder that used a steel tape instead of a steel wire for magnetic recording.
* [Butoba|http://www.butoba.net/homepage/butoba.html] - A 1950s portable tape recorder with wind-up transport. Early units were vacuum tube with 1.4V A battery and 90V B battery. Later units were transistor based. All used wind-up "clockwork" transport yielding long run time with low battery drain.
* [Capacitance Electronic Discs|http://www.cedmagic.com/selectavision.html] (RCA Selctavision). A play only videodisc system that used grooved discs (like phonograph records). However, instead of varying the depth and horizontal position of the groove, a conductive underlayer varied in height under the groove. The varying distance between the stylus and the conductive underlayer varied the capacity between the stylus and the underlayer. This is similar to a very high frequency capacitor (condensor) microphone.
* [ In Memoriam, Harold Lindsay|https://www.aes.org/aeshc/jaes.obit/JAES_V30_9_PG691.pdf] - Designer of the Ampex 200, the first Ampex tape recorder
* [History of Tape Recording|http://web.archive.org/web/20060316145954/http://www.tvhandbook.com/History/History_recording.htm] - Starts with Mullin's discovery of the German Magnetophones, the Ampex audio machines, the development of videotape, and audio tape cartridges.
* [History of Magnetic Recording in the United States, 1888-1978|https://smartech.gatech.edu/bitstream/handle/1853/24235/morton_david_l_199512_phd_438003.pdf.txt] - The history of magnetic recording is an important subject which has not received much scholarly attention. This study uses secondary historical sources in addition to manuscripts, technical documents, interviews, photographs, examinations of artifacts, and descriptive statistics to draw together a history of magnetic sound recording in the United States.
* [~LabGuy's World|http://www.labguysworld.com/] - EXTENSIVE collection of consumer video tape recorders with excellent links to other video sites.
* [Museum of Magnetic Sound Recording|http://museumofmagneticsoundrecording.org/] - The mission of the nonprofit Museum of Magnetic Sound Recording is to create and maintain a public museum in Austin, Texas  dedicated to the research, acquisition, restoration and preservation of vintage magnetic sound recording devices, their documentation and history,  and to serve as an educational resource for those interested in the sound recording industry.
* [Old Boys|http://www.vtoldboys.com/] - The 'Oldboys' web site began in 1998 which was the 40th 'birthday' of videotape in the BBC, and so it seemed appropriate to commemorate this with a small collection of pictures from the various decades. Since then it has expanded somewhat to over 1500 pages and 2400 pictures and, in November 2008, we celebrated our tenth birthday.
* [Phantom Productions Vintage Reel Tape Recorder Online Museum|http://reel2reeltexas.com/] - In collecting our vintage recorders, we have attempted to include pieces that had a significant role in the development of audio recording. Our focus is primarily on those reel to reel tape recorders that enabled musicians to hone their craft. We felt it would be interesting to include some of the early cylinder, disk and wire units, however, our main collection reflects the recorders that first became available to musicians and "prosumers" in the '50's, '60's, '70's and early '80's. So many innovations assisted the musician to capture that unique sound. They included, "sound with, and on sound," echo, and then came multi-tracking. Essential to the recordings were the microphones and mixer, so we've added some of those pieces as well. For perspective, we added reel to reel pages in radio catalogs from the late '30's to the early '80's and included tape recorder ads as well. We hope you enjoy our online information. Take a look at our "Phantom Time Line" page also. You'll see some of the audio and video units that were interesting benchmarks of production development. It continues to evolve as we have time. Enjoy!
* [Philips-Miller Film Recorder|http://www.orbem.co.uk/tapes/pm.htm] - Variable width optical recording. The recording was made by using a variable width "stylus" that was vertically modulated. As it dug deeper into the film, the width of the opaque material on the film that was cut away was increased. This is an interesting combination of mechanical recording (like a standard phonograph) and optical playback (the same as analog optical sound on photographic film.
* [Recording Technology History|http://history.sandiego.edu/gen/recording/notes.html] - Great site hosted by UC San Diego. Traces sound and video recording from tin foil cylinders, plastic disks, magnetic recording, and optical recording. Has info about Webster Chicago. I have one of their wire recorders. Also mentions Harold Lindsay of Ampex. Mr. Lindsay installed the stereo in my parents' home. hh
* [RCA 45 RPM Record Changer|http://www.downstairsrecords.com/about/rpm.html]
* [Sound and the Story|http://www.archive.org/details/SoundAndTheS%20to%20enjoy] - 1956 video by RCA showing how a phonograph record is produced, from recording to tape, cutting the disk, creation of molds and stampers, pressing, packaging, and shipping.
* [Soundfan|http://www.soundfan.it/en/home_en.html] - Site devoted to analog magnetic recording.
  * [History of Magnetic Recording|http://www.soundfan.it/en/history.html]
* [Vintage Cassette|http://www.vintagecassette.com/] - The independent cassette deck resource With over 2000 vintage single cassette decks of all brands from the 1970's until now.

! Telephone and Telegraph History
* [Any Lawful Device|http://arstechnica.com/articles/culture/carterfone-40-years.ars/1] - A brief history of Carterphone and Hushaphone
* [AT&T Long Lines|http://long-lines.net/] - The Microwave Radio and Coaxial Cable Networks of the Bell System
* The Latest Word in Communications - ["Microwave" - New York - Boston System |http://www.microwaves101.com/downloads/1947_ATTs_First_Microwave_Radio_Route.pdf], Long Lines Dept., Plant Division One. Describes the installation of the New York to Boston 4GHz microwave system by AT&T Long Lines. The link was covered with 8 hops. Posted at [microwaves 101|http://www.microwaves101.com], "your number-one source for microwave information since the previous unenlightened century." For fun, also see the [Microwave Mortuary|http://www.microwaves101.com/content/microwavemortuary.cfm].
* [Baudot.net|http://baudot.net/] - Teletype Machines - 100 years of Paper Tape and Teleprinters
* [Bell System Memorial|http://www.bellsystemmemorial.com]
* [Bell Systems Technical Journal|http://bstj.bell-labs.com/] 1922-1983. Includes the invention of the transistor, Shannon's Law of information, invention of CCD, etc.
  * [Bell Systems Technical Journal|https://archive.org/details/bstj-archives] at Internet Archive
* [Cedar Knol Telephone & Telegraph Company|http://www.voicenet.com/~pdwills/] - A Reconstruction of a Typical Pennsylvania Railroad Wire Chief's Office along with other examples of telephone technology.
* [Bruce Crawford Memorial Switching Documentation Library|http://www.switchersquarterly.org/library.htm] - Extensive telephone equipment documentation.
* [Car Phone|http://www.wb6nvh.com/Carphone.htm] - THE MOBILE TELEPHONE IN BELL SYSTEM SERVICE, 1946-1993. These pages are a history of the car telephone as used by the Bell System and its affiliates from the beginnings in 1946 through the end of IMTS telephone product production, although many IMTS car telephone radio systems continued on the air through the late 1990's and some are still on the air in Canada and Pennsylvania.
* [Electromagnetic Telegraph|https://mysite.du.edu/~jcalvert/tel/morse/morse.htm]- A nice history of the telegraph.
* [ESS, The First CO|https://www.tapinto.net/towns/roxbury/articles/succasunna-1965-the-wedding-of-phones-and-compu] - Newspaper article about the first ESS1 CO in 1965. Links to some videos including one by Western Electric on the ESS.
* [Evolution of the Dial Phone|http://www.arctos.com/dial/] traces the history of the dial telephone from 1919 through 1965. Photos of a bunch of telephones through history.
* [Central Office|http://www.thecentraloffice.com/] - Photos and brief histories of US telco central offices.
* [Hang Up|https://vimeo.com/95554820] - A movie about New York payphones.
* [History of Phone Phreaking|http://www.historyofphonephreaking.org/index.php] - Contains several articles on telephone signaling.
* [Independent Telecommunications Pioneer Association|http://www.nationalitpa.com/index.html] - ITPA is the volunteer organization created by and for the independent telecommunications industry.Dedicated to community service, ITPA has been serving the public  on behalf of telecommunications companies for over 95 years. ITPA represents over 9,000 telecommunications employees and retirees nationwide. Today Pioneers continue to open exciting new lines of communication and community  service throughout the United States.
* [ITU|https://www.youtube.com/watch?v=7qv5xw4fsh8] - 1966 film about the International Telecommunications Union
* [JKL Museum of Telephony|http://jklmuseum.com/] - The American Museum of Telephony (AMoT), known familiarly as the JKL Museum, is dedicated to the preservation of all aspects of telephony.
* [Manufacture Discontinued|http://www.manufacturediscontinued.com/] - This site is dedicated to the study and appreciation of the telephones of the 1950's, 60's and 70's, especially those made by the Western Electric company for the Bell System in America. I'm Adam Forrest, and I like telephones, especially the Western Electric telephones of the fifties, sixties and seventies. Although I'm a computer programmer and web designer now, I spent the bulk of my younger days learning about, and then installing and repairing telephones and small PBXs. This site is a collection of some of the things I enjoy looking at, I guess it's sort of a telephone collector's blog. I hope you enjoy looking at these phones too
* [Morse Code’s Vanquished Competitor: The Dial Telegraph|https://spectrum.ieee.org/telecom/standards/morse-codes-vanquished-competitor-the-dial-telegraph] - In 1842, French watchmaker Louis-François Breguet invented a simpler to use but less efficient alternative
* [Museum of Communications|http://www.museumofcommunications.org/] in Seattle Washington. Extensive collection of customer premises equipment, central office equipment, and outside plant. More photos available [here|http://www.privateline.com/Seattlemuseum/index.html].
* New York Times
  * [Automatic Phones Soon To Work Here|http://query.nytimes.com/mem/archive-free/pdf?res=9F02E4DD1E3EEE3ABC4A52DFB5668389639EDE], March 12, 1922. Describes the conversion of 1,000,000 phones in New York City to dial operation. "While no telephone girls will lose their positions because of the introduction of automatic machinery, the force will eventually be reduced, but not so rapidly as the girls now leave the service to get married or take other jobs"
  * [Dial Phone System Meets Sunday Test|http://query.nytimes.com/mem/archive-free/pdf?res=940CE5D91E39EF3ABC4E52DFB6678389639EDE], October 16, 1922
  * [New Telephones Please, 16 Seconds To Make Connection|http://query.nytimes.com/mem/archive-free/pdf?res=990CEFD71E39E133A25754C1A9649D946395D6CF], December 17, 1922
  * [Automatic Phones Start Saturday|http://query.nytimes.com/mem/archive-free/pdf?res=9D02E5DE1139E133A2575BC0A9669D946395D6CF], October 8, 1922
  * [Niagra Power May Come Here By Radio|http://query.nytimes.com/mem/archive-free/pdf?res=9D02E5DE1139E133A2575BC0A9669D946395D6CF], October 16, 1922. Vacuum tubes are replacing high frequency alternators for wireless telegraph transmission. Describes the introduction of water cooled tubes. Speculates that power may be transmitted by radio instead of wires.
* [Panel Switchman's Photo Stream|http://www.flickr.com/photos/9479603@N02/] - Extensive collection of photos from the 1920s on. Shows manual switchboards, step, crossbar, panel, and ESS. [slideshow|http://www.flickr.com/photos/9479603@N02/show/]
* [Payphone Project|http://www.payphone-project.com/] - Photos and stories about payphones. Also a payphone number database.
* [Pulse of the World|https://www.youtube.com/watch?v=6fu6-jrzOyM&feature=youtu.be] - 1924 Mackay System documentary. Great silent video showing operation of the Mackay telegraph system. Shows land and undersea cable installation and repair. Shows operators and a bunch of other great stuff.
* [Pushbutton Calling with a Two- Group Voice Frequency Code|Upload:harold/dtmf_bell_labs.pdf], L. Schenker, Bell Labs Technical Journal, January 1960. Described the design considerations for DTMF (Touch Tone&reg;) signalling.
* [Private Line Telephone History|http://www.privateline.com/history.html] including POTS, wireless, Bell Labs, exchange name history, party lines, Strowger switches, early radio, radar, triode vacuum tube history, etc.
* [Phone Trips|http://www.wideweb.com/phonetrips/] - Extensive recordings of the sounds heard during the progress of call completion through various types of switches. Most recordings made in the 1960s and 1970s.
* [Remember phone books?|http://johngall.blogspot.com/2010/10/remember-phone-books.html] - Nice collection of phonebook cover photographs.
* [RTTY Electronics|http://www.johnwhitney.com/misc/paul-rtty.htm] - Where to get parts for your old Teletype!
* [Sam's Telecomm History Links|http://www.samhallas.co.uk/histlink.htm] - Very extensive page of links to sites devoted to telecom history.
* Mike Sandman's [telephone history|http://www.sandman.com/telhist.html] page. Features old telephone advertising and other nice info.
* [Strowger Switch|http://www.strowger.com/history.html] - The first automatic telephone switch. Strowger switch patent [447,918|http://www.freepatentsonline.com/0447918.pdf]
* [Strowger Appreciation Site|http://web.ukonline.co.uk/uax13/] - Site dedicated to the sights and sounds of step exchanges. See especially the bottom of the home page for audio recordings of various step offices.
* http://www.telebeans.org/ - Telecom stuff for the Mid-Atlantic.
* [Telegram and Cable Company|https://www.telegramcableco.com/] - Send a telegram today! Submit message over web site. It's printed on a Teletype and mailed.
* [Telegraph|http://mysite.du.edu/~jcalvert/tel/telhom.htm] - The History of Telecommunications and Related Matters. An EXTENSIVE history of the telegraph by [Dr James B. Calvert|http://mysite.du.edu/~jcalvert/] at [University of Denver|http://mysite.du.edu].
* [Telegram for America|https://archive.org/details/Telegram1956] - 1956 film about the wonders of Western Union. Promotional film for Western Union Telegraph Company, featuring its history, current practice and emerging technology. Pictures Western expansion; railroads; early hand telegraphy and telegraph keys.

  Shows 1950s-vintage teletype and paper tape network serving all cities and towns in the United States. Shows telegraphy of service in business, to families, to government, in natural disasters (floods and fires) and in the commodities market.

  Numerous scenes of 1950s business and industry. Footage of Western Union plant and facilities, including the microwave tower located in the Tenleytown district of Washington, D.C. Considerable coverage of new technology including facsimile (fax) transmission and delivery of telegrams. Also coverage of the "Telmobile," a mobile reception center for fax telegrams that then delivers them to customers in outlying suburban districts.
* [Telegraph Office|http://www.telegraph-office.com/] - A Tribute to Morse Telegraphy and Resource for Wire and Wireless Telegraph Key Collectors and Historians
* [Telephone Answering Machines|http://inventors.about.com/library/inventors/blansweringmachines.htm] - A brief history.
* [Telephone Archive|http://www.telephonearchive.com/] - NICE collection of documentation back to 1910 or so.
* [Telephony Document Archive|http://sc.infc.info/] - Extensive telephone system documentation collected by Steve Cichorsky.
* [Telephone Technical Reference|http://www.kadiak.org/tel/index.html] at Kadiac.org. Extensive document collection.
* [Telecom Digest|http://telecom-digest.org/] long running telecom newsgroup that has a fair amount of history.
* [Telecom History Group|http://www.telcomhistory.org/] proudly preserves and shares the rich heritage of an industry that has had and continues to have a huge impact on our society, our culture, and most of all, our ability to communicate. THG has museums in Denver CO and Seattle WA.
* [Telephone Collectors International|http://www.telephonecollectors.org/] - the international organization of collectors of old telephone equipment.
  * [Telephone Collectors International Document Library|http://www.telephonecollectors.info/] - Extensive collection, including Bell Systems Practices
* [Telephone Tribute|http://www.telephonetribute.com/] You'll find all sorts of telephone related web pages here on the history of the telephone, technical information, research resources, human interest stories, clubs, pictures, sound files, links, etc.
* [Telephone World|http://www.phworld.org/] - History, sounds, pictures, pay phones, network, switching systems, etc.
* [The Coming of the Dial|https://www.youtube.com/watch?v=GFbRvAuJkXg] - 1933 video
* [The Independent|https://www.youtube.com/watch?v=-NF_SQCTeYk] - 1957 film promoting independent telephone companies. Shows a cutover to a new step exchange.
* [This Is A Recording|https://www.thisisarecording.com/index.html] - EXTENSIVE collection of recordings of telephone automated messages (wrong number, etc.)
* [United States Military Telegraph|http://www.unitedstatesmilitarytelegraph.org/contents.html] - Site contains extensive documentation on telegraph use during the US Civil War and developments leading up to that point.
* [Western Union Alumni|http://www.westernunionalumni.com/] - LOTS of stuff on Western Union, the nation's telegraph company since 1851.
* [Western Union Technical Review|http://massis.lcs.mit.edu/telecom-archives/archives/technical/western-union-tech-review/] - Published 1947 through 1969. The technology of telegraphy, including multiplexing, switching, transmission, etc.
  * [New American Code for Information Interchange|http://massis.lcs.mit.edu/telecom-archives/archives/technical/western-union-tech-review/18-2/p050.htm] - April 1964. Introduces the newly adopted ASCII code
* Tom Farley's [Telephone History|http://www.privateline.com/TelephoneHistory/History1.htm] pages.
* [Western Union's  Microwave Relay Terminal in Washington DC|http://blog.historian4hire.net/2010/12/03/wutco-tenley/]
* [Western Union Telegraph Company History of Technical Progress|http://telecom.csail.mit.edu/wutechprogress/]
* [YArchive|http://yarchive.net/phone/index.html] - Norman Yarvin's extensive usenet news archive of telephone information.
* [Your Life's Work|https://www.youtube.com/watch?v=VoQtd9apEUg] - 1946 film about working in the telephone and telegraph industries.

! Receiver History
* [Jonz Valve Page|http://www.thevalvepage.com/] - Extensive photo galleries and restoration info for old radios and televisions.
* [My Vintage TV|http://www.myvintagetv.com/] - A tour of home entertainment equipment from 1895 to 1955
* [National] - Communications receivers and early television receivers
* [Philco Radio|http://www.philcoradio.com/] - History, photos, schematics of stuff from the Philadelphia Storage Battery Company.
* [Regency TR-1|http://people.msoe.edu/~reyer/regency/] - The first transistor radio! Site includes video of the assembly line building these radios in 1955.
* [transistor.org|http://www.transistor.org] - Sarah Lowrey's great collection of transistor radios, with photos, articles, restoration procedures, etc.
* [All American Five|http://pw1.netcom.com/~wa2ise/radios/aa5h.html] - The popular five tube radio


! Computers, Calculators, Digital Electronics History
* [Antique Computers|http://ed-thelen.org/comp-hist/] - An extensive collection of photos and documents on computer history by Ed Thelen.
* [Apollo Guidance Computer|http://www.galaxiki.org/web/main/_blog/all/build-your-own-nasa-apollo-landing-computer-no-kidding.shtml] - Instructions on building your own Apollo Guidance Computer used in the moon landing of 1969. The Apollo AGC itself is a piece of computing history, it was developed by the MIT Instrumentation Laboratory and it was a quite amazing piece of hardware in the 1960s. It was the first computer to use integrated circuits (ICs), running at 1 Mhz it offered four 16-bit registers, 4K words of RAM and 32K words of ROM. The AGC mutlitasking operating system was called the EXEC, it was capable of executing up to 8 jobs at a time. The user interface unit was called the DSKY (display/keyboard, pronounced "disky"); an array of numerals and a calculator-style keyboard used by the astronauts to communicate with the computer.
* [Bell Systems Technical Journal|http://bstj.bell-labs.com/] 1922-1983. Includes the invention of the transistor, Shannon's Law of information, invention of CCD, etc.
* [BitSavers|http://www.bitsavers.org/] - Saving computer history from the dumpster! They have more than 830,000 pages of scanned computer documents in their archive. Also, links to other historic computer sites.
* [Catweasel|http://www.jschoenfeld.de/products/catweasel_e.htm] is an interesting product that lets you use standard PC drives to read old floppies (all PC-formats (180K up to 1440K), Amiga DD and HD (also 5,25" formats), Atari 9, 10 and 11 sektor disks, Macintosh 720K, 800K, 1440K (DD, GCR, HD), Commodore 1541, 1571, 1581 (C64, C128 and 3,5" C-64 disks), XTRA High density with 2380KByte per disk, Nintendo backup station 1600KB format, Atari 800XL (all MFM formats, FM under developement), Apple IIe disks (Apple DOS 3.3 and up)
* [The Charles Babbage Institute|http://www.cbi.umn.edu/index.html] - The Charles Babbage Institute (CBI) is an archives and research center dedicated to preserving the history of information technology and promoting and conducting research in the field.
* [Computer Conservation Society|http://cedarsgw2.leeds.ac.uk/ccs/] - Conserving the UK computer heritage.
* http://www.computer-history.info/ - Stories of the Development of Large Scale Scientific Computing at Lawrence Livermore National Laboratory
* [Computer History Museum|http://www.computerhistory.org], Mountain View, CA - preserves and presents for posterity the artifacts and stories of the information age. As such, the Museum plays a unique role in the history of the computing revolution and its worldwide impact on the human experience.
* [Eckert Tapes|http://www.computerworld.com/hardwaretopics/hardware/mainframes/story/0,10801,108790,00.html?from=story%5Fkc] - Transcript of interview with J. Presper Eckert, one of the developers of the ENIAC, the first all electronic digital computer (with 18,000 vacuum tubes). Computerworld, February 20, 2006
* [CPU Shack|http://www.cpushack.com/] - CPU History Museum for Intel CPUs, AMD Processor, Cyrix Microprocessors, Microcontrollers and more.
* [Report on the Eniac|http://ftp.arl.army.mil/~mike/comphist/46eniac-report/index.html], developed under the supervision of the Ordnance Department, United States Army. June 1, 1946. Detailed description of the ENIAC.
* [fourmilab.ch|http://www.fourmilab.ch/sitemap.html#history] - Univac history, Babbage Analytical Engine, and a history of AutoCAD
* [Historic Computer Images|http://ftp.arl.army.mil/ftp/historic-computers/] by Mike Muuss. Many are US Army photos.
* [History of Computing Information|http://ftp.arl.army.mil/~mike/comphist/] - Information about the history of computing, assembled by Mike Muuss for your information and edification. Documents from the  home of the ENIAC  --  The U. S. Army Research Lab .
* [HP Museum|http://www.hpmuseum.org] - Calculators!
* [History of Computing Information|http://ftp.arl.army.mil/~mike/comphist/] - Information about the history of computing, assembled by Mike Muuss for your information and edification. Documents from the  home of the ENIAC  --  The U. S. Army Research Lab .
* [A Brief History of the Hard Drive|http://news.com.com/2300-1010_3-6031405-1.html?tag=nl] - Nice photo collection starting with the IBM RAMAC drive of 1956, which held 5MB.
* http://www.nsf.gov/news/special_reports/nsf-net/home.jsp - History of Internet at NSF
* [Kelley Ad|http://www.kelleyad.com/histry.htm] shows and describes the early advertising for Apple
* [LED Watches|http://www.ledwatches.net]
* [Mouse Site|http://sloan.stanford.edu/MouseSite/MouseSitePg1.html] - A history of the mouse and human/machine interface. Excellent info at Stanford University.
* [National Security Agency Center for Cryptographic History|http://www.nsa.gov/about/cryptologic_heritage/center_crypt_history/] - History of cryptography as used by the NSA. See, especially [Historical Publications|http://www.nsa.gov/about/cryptologic_heritage/center_crypt_history/publications] for documents showing the history of cryptography from pre-WW1 through the Viet Nam war.
* [National Museum of Computing|http://www.tnmoc.org/] is dedicated to showing the development of computing in its broadest sense from the pioneering war time efforts that resulted in Colossus, to the products and systems we use today. The museum is part of the whole Bletchley Park experience, and all visitors to the park can visit the museum free of charge when it is open. The museum houses the Colossus computer, an exhibition of the most complex code cracking activities performed at the Park, and enhances the Park visitors' experience by continuing the history of the development of computing from the 1940s to the present day.
* [Online Timeline|http://iml.jou.ufl.edu/CARLSON/timeline.shtml] - A capsule history of online news and information systems by David Carlson. In particular, [this history of The Source|http://iml.jou.ufl.edu/CARLSON/history/the_source.htm] is interesting since I (HH) used this before I had a computer. I built a 300bps modem and connected to The Source with a Lear Siegler ADM-1 terminal. They had an MC6800 cross assembler on the system I used to develop my first microprocessor based product.
* [Old Computers . com|http://www.old-computers.com] - The name says it all... Remember the Altair? The PET, the VIC-20? The PDP-8?
* Radio Shack
  * Ira Goldklang's TRC-80 Revival|http://www.trs-80.com/] - This site is devoted to providing extensive information on the line of TRS-80 personal home computers, with a specific focus on the Model I, Model III, and Model 4. There is also SOME information on the Model 100/102, Model 200, Model 600, Color Computer, and Pocket Computer lines as well as Printers. Information from these links includes product descriptions, catalog numbers, pictures, prices, operations, hardware, software, etc.
  * [TRS-80.org|http://www.trs-80.org/] - Extensive history with several interviews.
  * [Jeff Vavasour's TRS-80 EMULATION Page|http://www.vavasour.ca/jeff/trs80.html] - Emulate various Radio Shack computers
* [Relay Computer|http://www.cs.pdx.edu/~harry/Relay] - While not strictly historic, it's interesting nonetheless. A computer made with relays (used as gates, flip flops, ALU, etc.).
* [Retrocomputing Archive|http://www.retroarchive.org/] - This site was created as a logical extension to the original Commercial CP/M Software Archive. The focus has been expanded to encompass all types of "classic" computer systems and their software, not just CP/M.
* [Retrowagon|https://wiki.theretrowagon.com/wiki/Main_Page] - A wiki about vintage computers from the dawn of the personal computer
* [Signetics Write Only Memory|http://web.archive.org/web/20120316141638/http://www.national.com/rap/files/datasheet.pdf]
* [Southwest Technical Products|http://www.swtpc.com/] early supplier of audio and computer kits.
* [Trailing Edge|http://www.trailing-edge.com/] - Archive of software for old DEC machines. Also, the Computer History [Simulation Project|http://simh.trailing-edge.com/] which simulates the Data General Nova, Eclipse, Digital Equipment Corporation PDP-1, PDP-4, PDP-7, PDP-8, PDP-9, PDP-10, PDP-11, PDP-15, VAX, GRI Corporation GRI-909, IBM 1401, 1620, 1130, System 3, Interdata (Perkin-Elmer) 16b and 32b systems, Hewlett-Packard 2116, 2100, 21MX, Honeywell H316/H516, MITS Altair 8800, with both 8080 and Z80, Royal-Mcbee LGP-30, LGP-21, Scientific Data Systems SDS 940
* [Vintage Calculators . com|http://vintagecalculators.com/] - A celebration of old calculators showing the evolution from mechanical calculator to pocket electronic calculator.
* [Unix Haters Handbook|http://www.simson.net/ref/ugh.pdf]

! Data Communications
* [Bell Systems Technical Journal|http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1538-7305c/issues?activeYear=1922] 1922-1983. Includes the invention of the transistor, Shannon's Law of information, invention of CCD, etc.*[Internet Archive|http://www.archive.org] - See web pages archived from 1996 on.
* [Internet Historical Society|http://history-internet.org] - A history of the net, with lots of links.
* [FCC Short History of internet|http://www.fcc.gov/omd/history/internet/] - Something to Share, Common Standards, Making the Connections
* [Hayes Photo Album|http://www.wa4dsy.com/heatherington/hayes/index.html] - Some photos and video from the start and end of Hayes modems. [Manuals and schematics|http://www.heatherington.net/hayes/downloads.html]
<verbatim>
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* [Living Internet|http://www.livinginternet.com/] - An elegantly organized tour of the Internet, both fun and informative, a rare combination!
* [Teletext|http://teletext.mb21.co.uk/] - Data broadcasting on the Vertical Blanking Interval

! Transistors and Semiconductors
* [60s and 70s Semiconductor Datasheet Collection|https://drive.google.com/folderview?id=0BxMD1ibIHfSxNkVlTE1rLWhQZ1k] - Scanned datasheets
* [Semiconductor Museum|http://semiconductormuseum.com/Museum_Index.htm], aka Transistor Museum - The Transistor Museum has grown significantly over the years since we first appeared on the web in 2001.  In that timeframe we’ve added hundreds of pages of unique material specifically developed for those interested in the history of the transistor. In these past 14 years, all areas of the Museum have been expanded, including Oral Histories, Photo Gallery Pictures, Acquisitions and Donations, Photo Essay Research Articles, Construction Projects, Timeline of Transistor History, and many other areas covering topics important to transistor history.

! Electricity
* [A History of Impedance Measurement|http://www.ietlabs.com/pdf/GenRad_History/A_History_of_Z_Measurement.pdf] - Lots of bridges!

! Other Historic Sites
* [Allied Catalogs|http://www.alliedcatalogs.com/] - 1928 - 1981 catalogs from Allied Electronics. Includes the Knight Kit [Wireless Broadcaster|http://www.alliedcatalogs.com/html/1959-180/h263.html]
* [Heathkit|http://www.heathkit-museum.com] - Revists the Heathkit age which began in the late 1940's and lasted through the early 1990's.
* [Bell Systems Technical Journal|http://http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1538-7305c/issues?activeYear=1922] 1922-1983. Includes the invention of the transistor, Shannon's Law of information, invention of CCD, etc.
* [Bill's Retro World|http://www.billsretroworld.com/] - Nice collection of photos from old television programs, advertisements, and general photos from the 1950s and 1960s.
* [Carl and Jerry|http://home.gwi.net/~jdebell/pe/cj/cnjindex.htm]- The Carl and Jerry stories from Popular Electronics, October 1954 through December 1964
* [Classic Tek|http://classictek.org/] - WONDERFUL site full of manuals, photos, video, and other info on Tektronix.
* [Derek's Virtual Slide Rule Gallery|http://www.antiquark.com/sliderule/sim/] - Real nice simulations of slide rules!
* [Einstein Papers Project|http://www.einstein.caltech.edu/] - The collected papers of Albert Einstein.
* [Hearing Aid Museum|http://www.hearingaidmuseum.com/] - From ear trumpets to carbon microphones to vacuum tubes, to transistors, to digital signal processors. Hearing aids have changed over the years.
* [Kight Kit|https://knightkit.com/] - Home of the Knight Kit Wireless Broadcaster
* [Mark Cselle's History of Technology Page|http://technology.niagarac.on.ca/staff/mcsele/history.htm] - Extensive information on history of power generation, telephone, computers, vacuum tubes, etc..
* [Mike's Electric Stuff|http://www.electricstuff.co.uk/] has a nice collection of info on vaccum tubes, Nixies, and more.
* [The Oughtred Society|http://www.oughtred.org/] - The Oughtred Society was founded in 1991 by a group of slide rule collectors and is dedicated to the preservation and history of slide rules and other calculating instruments. In the past fourteen years it has evolved to an international organization with members in 22 countries. It is noted for its highly acclaimed Journal of the Oughtred Society,
* [Philbrick Archive|http://www.philbrickarchive.org/] - This site is a free non-profit repository of materials from GAP/R George A Philbrick Researches, the company that launched the commercial use of the Operational Amplifier in 1952.
* [Radio Shack Catalogs|http://www.radioshackcatalogs.com/] - Excellent collection of Radio Shack print catalogs from the first 1939 catalog through 2003.
* [Semiconductor Museum|http://semiconductormuseum.com/Museum_Index.htm] - Great collection of photographs and oral histories of the developments of semiconductors. For example, an oral history describes the development of the 2N2222, which was released in 1962 and is still being designed into products today.
* [Southwest Museum of Engineering,Communications and Computation|http://www.smecc.org/] - A very extensive collection of physical and online resources.
* [Spark Bang Buzz|http://sparkbangbuzz.com/] - While not truly history, it does tell you how to build many devices from history. Projects include several based on zinc negative resistance, copper oxide thermo electric generator, magnetic amplifiers, an 80m transmitter built around a 2N3904, an alcohol flame triode amplifier, home made CRT tube, arc transmitters, home made coherer, home made vacuum tube triode, sound modulated LED, laser, and flashlight, etc. Fun stuff!
* Telharmonium - The Telharmonium (also known as the Dynamophone) was an early electronic musical instrument, developed by Thaddeus Cahill in 1897. The Telharmonium was intended to be listened to using telephone receivers.
  * [Wikipedia|http://en.wikipedia.org/wiki/Telharmonium]
  * [Magic Music From The Telharmonium Documentary|http://www.youtube.com/watch?v=PPlbXl81Rs0] on ~YouTube
* [Tesla Wardenclyffe Project|http://www.teslascience.org/] - mission is the preservation and adaptive reuse of Wardenclyffe, the century-old laboratory of electrical pioneer Nikola Tesla located in Shoreham, Long Island, New York.
* [Tube Books dot Org|http://www.tubebooks.org/] - Herein you will find a collection of vintage engineering texts, vacuum tube datasheets, and other obsolete information, presented free of charge and without annoying advertisements.
* http://www.pat2pdf.org/ - Free online conversions of USPTO patent images to pdf for easy viewing. Just supply the patent number.
* [Watthourmeters.com|http://watthourmeters.com/] - An online reference to US made watthour meters.
* [Weston Engineering Notes|http://www.slbench.com/Home/westonengineeringnotes-1] - "Weston Electrical Instrument Corporation, founded in 1888, is responsible for many important developments in the electrical engineering field.  Several years ago, I came across a 3 year collection of Weston Engineering Notes starting in 1946.  This was a far different time and many of the things we take for granted today weren't even dreams of the future yet.  Clicking the above logo will give you an enlarged sketch of an engineer's desk.  Engineering and physics books (complete with log tables) close at hand.  The ever present slide rule, a sharp pencil, drafting triangle and the all-important eraser being important tools of the trade.  A tube and a large can capacitor are part of a current project.  An analog meter waiting to prove or dis-prove the latest theory.  The pipe to be used while pondering the latest developments and speculating about the future."
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<b>Contribute</b><br>
NOTE - Due to wiki spam, only registered users can edit pages. If you have a scan of a manual that you'd like posted, please [email it to me|mailto:harold@hallikainen.org].

Scanned contributions are most appreciated! Ideally, they should be PDF files using 300dpi. Use an appropriate bit depth for each page. If a page is just text or line art, use 1 bit per pixel. For black and white photography, use 8 bits per pixel. For spot color, try to use 8 bits per pixel. For full color, use 24 bits per pixel. Very large files (more than 50M) should be broken into sections (pages 1 through something in one file, more pages in another file, etc.). Finally, try running "Paper Capture" on the files with the OCR text "in the background." Use File - Preferences - Paper Capture - Original Image With Hidden Text. The user sees the scanned image. The OCR text is available to copy and paste and to search engines.

If you did not scan the material yourself, please obtain permission and credit the person who did. If you find appropriate information on another website, it'd be best to link to that site instead of copying material from it (especially without permission).

<b>About Copyright</b>
Some of the material on this site may still be under copyright. Use of material here is intended to be fair use allowing researchers to study the history and evolution of broadcast equipment. If, however, you hold the copyright on material on this site and you would like the material removed, please let me know. The material will be removed immediately.

Thanks!

Harold Hallikainen<br>
mailto:harold@hallikainen.com

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