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Tube Substitutions for:
6221
Medium-Mu Triode

Type	Substitutes	Base Diagram
6221		8HF
Web References	6221 (Sonotone) @ Franks Electron Tubes 6221 @ RadioMuseum.org

Type 6221
Medium-Mu Triode


MECHANICAL DATA

Basing

8HF

ELECTRICAL DATA

HEATER CHARACTERISTICS

Heater Voltage	6.3	Volts
Heater Current	0.175	A

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