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Tube Substitutions for:
4-125A
Power Tetrode
TypeSubstitutesBase Diagram
4-125A4D21, 4D21A, 61555BK
Web References4-125A (RCA (HB3)) @ Franks Electron Tubes


Type 4-125A
Power Tetrode



MECHANICAL DATA

Basing5BK


ELECTRICAL DATA


HEATER CHARACTERISTICS
Heater Voltage5Volts
Heater Current6.5A


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