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In Reply to: RE: 01A, 201A, and 301A tubes posted by Thomas Mayer on October 24, 2016 at 13:41:45
1920: UV200. 5v filament, 1A. RCA with argon gas filling, and the UV201 Amplifier by GE
1922: GE replaces the UV201 with the UV201A, having now a thorium 250mA filament, brass base and a tipped glass top.
1924 mid: Bakelite base, round glass top.
1925: UX201A Globe. Cunningham names it CX301A.
1926: UX200A is caesium vapour tube
1932: ST (shoulder, dome) shape and name changed to 01A. Production by GE and Westinghouse. Radiotron rebadged those, but started its own production in 1930.
Follow Ups:
Hello Andy,
I am trying to get a custom sockets for 201A's but I do not have the valves yet. Do you happen to know the OD (outside diameter) of the pins of the 201A valve?
Thanks!
Abe
UX pins are 4mm and slightly over 3mm
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