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201A

Sensibly equivalent to:
CT-201A UX201A+D4823
    
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The Type 201A is the thoriated tungsten filament version of the Type 201 that was introduced by RCA in 1920. Type 201 was an amplifier and the Type 200 was a detector.
These Types were made with various prefixes. The original UV- prefix denoted the UV base.
The silvered envelope, magnesium gettering, just gives the type designation of 201-A.
The balloon envelope is 45 mm in diameter and, excluding the four base pins, is 95 mm tall.
Reference: 1047. Type 201A was first introduced in 1922.

 

Pin Connections
UV
1
2
3
4
f
a
g1
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
5.0
0.25
135
-9
Updated March 08, 2014.
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