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C301A

Sensibly equivalent to:
DC201A UV201A
    
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The C301A is a battery amplifier triode from the 1920's. The filament is thoriated tungsten.
Thanks to Dan Absher for the picture.
The balloon envelope is  mm in diameter, and excluding the UV base pins is  mm tall.
Reference: 1047. Type C301A was first introduced in 1922.

 

Pin Connections
UV
1
2
3
4
f
a
g1
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
5.0
0.3
0.25
Updated February 04, 2014.
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