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Tube Substitutions for:
 6688
 Sharp-Cutoff Pentode
TypeSubstitutesBase Diagram
66889EQ
Web References6688 @ RadioMuseum.org


Type 6688
Sharp-Cutoff Pentode


MECHANICAL DATA
Basing9EQ


ELECTRICAL DATA

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


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