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it's in the RC27 RCA tube manual.
12 pin compactron also comes in a 21v heater @0.45A version.
33v @ 0.3A heater
130v plate voltage:
screen volts 130v
plate resistance 11K
transconductance 9100 umhos
plate current 50ma
G1 volts -20v
G3 tied to cathode
G1 grid resistance max 1 meg
triode connection mu 4.7
plate dissipation max 18w
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