• 90-B Recording Amplifier is a portable recording console contining all the facilities necessary for operations on remote assignments, but with an overall performance found only in high fidelity studio equipment. The 90-B consists of three preamplifiers with individual gain controls, a mixer circuit, a master gain control and recording amplifier. Provision is made for connecting the Presto 161-A automatic equalizer (radius compensator). 1948. Contributed by Timothy Hughes. 8.5MB

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