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C301A

Sensibly equivalent to:
DC201A UV201A
    
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The Cunningham C301A (C-301A) is equivalent to the UV201A. This exhibit also has phosphorus gettering. These were known as 'Rainbow Tubes' and phosphorus gettering was common in Cunningham valves.
Through the bulb can be seen the vertical triode assembly.
The original box with the Type designation expressed as C-310-A. This Cunningham valve was also made by General Electric.
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 C301A 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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