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Tube Substitutions for:
27
Low Mu Triode
TypeSubstitutesBase Diagram
2756, 27S, 56S, 27A*
Notes:* - Parallel filaments
Web References27 (RCA) @ Franks Electron Tubes
27 (RCA (HB3)) @ Franks Electron Tubes
27 (Sylvania) @ Franks Electron Tubes
27 (Tung-Sol) @ Franks Electron Tubes
27 @ RadioMuseum.org
RCA Type 27
DETECTOR, AMPLIFIER



MECHANICAL DATA

Bulb S-14
Base Medium 5 Pin
Basing 5A


ELECTRICAL DATA


FILAMENT CHARACTERISTICS
Filament Voltage 2.5 Volts
Filament Current 1.75 Amps

DIRECT INTERELECTRODE CAPACATIES
Grid-Plate Capacitance 3.3 ��f
Grid-Flimaent Capacitance 3.5 ��f
Plate-Flimaent Capacitance 3.0 ��f

MAXIMUM RATINGS
Plate Voltage1 90 135 180 250 Volts
Grid Voltage -6.0 -9.0 -13.5 -21.0 Volts
Plate Current 2.7 4.5 5.0 5.2 Ma
Plate Resistance 11000 9000 9000 9250 Ohms
Amplification Factor 9.0 9.0 9.0 9.0 x
Transconductance 820 1000 1000 975 �mhos

NOTES:

1 Maximum plate voltage == 275 volts.


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