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UV201A

Sensibly equivalent to:
201A
    
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The UV201A, introduced in October 1922, has a thoriated tungsten filament and replaced the UV201. In 1923 it was the most widely sold valve in the USA.
By the end of 1922 RCA held exclusive patents.
The valve is fully gettered and the hard vacuum valve has replaced the soft valves. The box indicates that the UV201A is intended for both detection and amplification.
The original box.
Thanks to Joe Gruber for sending the images.
The envelope is  mm in diameter and, excluding the UV base pins, is  mm tall.
References: 1047 & Joe Gruber. Type UV201A was first introduced in 1922.

 

Pin Connections
UV
1
2
3
4
g1
f
f
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
5.0
0.25
20-100
Updated February 12, 2021.
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