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ID = 70821
United States of America (USA)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 very rare. ***
Identical to A_UV-base = UV201A = C301A

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =

The A tube is a derivitave of the RCA UV201A which was developed by the General Electric Co in October 1922. It was announced to the public at the New York Radio Show two months later. Following this announcement, many companies made the tube with a multitude of brand names and type numbers, most of which included the main designation 201a. A few of these manufacturers made what they called the type A. The commercial life of the type A was short lived as, when the new and improved UX201A was announced in August 1925, the type identification was discontinued.

Information source Radio Tubes and Boxes of the 1920’s   Page 9

uxsockel_11~~39.png A_UV-base: Fin Stewart
Fin Stewart

Just Qvigstad

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