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Tube Substitutions for:
33
Power Pentode
TypeSubstitutesBase Diagram
33
Web References33 (RCA) @ Franks Electron Tubes
33 (RCA (HB3)) @ Franks Electron Tubes
33 (Sylvania) @ Franks Electron Tubes
33 (Tung-Sol) @ Franks Electron Tubes
33 @ RadioMuseum.org
RCA Type 33
POWER AMPLIFIER PENTODE



MECHANICAL DATA

Bulb ST-14
Base Medium 5 Pin
Basing 5K


ELECTRICAL DATA


FILAMENT CHARACTERISTICS
Filament Voltage 2.0 Volts
Filament Current 0.260 Amps

MAXIMUM RATINGS
Plate Voltage 135 Volts
Screen Voltage 135 Volts
Grid Voltage -13.5 Volts
Plate Current 14.5 Ma
Plate Resistance 50000 Ohms
Amplification Factor 70.0 x
Transconductance 1450 �mhos
Load Resistance 7000 Ohms
Undistorted Power Output 0.7 Watt


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