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Tube Substitutions for:
6690
Medium-mu Twin Triode

Type	Substitutes	Base Diagram
6690		8GQ
Web References	6690 (Philco) @ Franks Electron Tubes 6690 @ RadioMuseum.org

Type 6690
Medium-mu Twin Triode


MECHANICAL DATA

Basing

8GQ

ELECTRICAL DATA

HEATER CHARACTERISTICS

Heater Voltage	6.3	Volts
Heater Current	0.3	A

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