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RE: 01A, 201A, and 301A tubes

Posted by andy evans (A) on October 24, 2016 at 14:55:02

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.

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