Philips valves dominated the market in much of Europe. Their side-contact series standardized basing in Europe, at the same time as the Octal base became the standard in American dominated markets. However before the Second World War Philips made only a minor penetration into the British sphere of influence, despite having launched an octal based "Red" series to compete with the American Octal series. Some charts have data slipped sideways by a column due to a missing "Mutual Conductance normal" column.

*Miniwatt Valves - 1938 catalog of receiving tubes. Contributed by Tim Hughes. 11MB

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