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Tube Substitutions for:
2D21
Tetrode (Thyratron)
TypeSubstitutesBase Diagram
2D212D21W, 5727
Web References2D21 (Mazda-Belvu) @ Franks Electron Tubes
2D21 (RCA (HB3)) @ Franks Electron Tubes
2D21 (Sylvania) @ Franks Electron Tubes
2D21 (Brimar) @ Franks Electron Tubes
2D21 (RCA (RC30)) @ Franks Electron Tubes
2D21 @ RadioMuseum.org


Type 2D21
Tetrode (Thyratron)



MECHANICAL DATA

Basing7BN


ELECTRICAL DATA


HEATER CHARACTERISTICS
Heater Voltage6.3Volts
Heater Current0.6A


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