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#9
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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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