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Tube Substitutions for:
 HK257
 Beam Power Pentode
TypeSubstitutesBase Diagram
HK2577BM
Web ReferencesHK257 @ RadioMuseum.org


Type HK257
Beam Power Pentode


MECHANICAL DATA
Basing7BM


ELECTRICAL DATA

HEATER CHARACTERISTICS
Heater Voltage5Volts
Heater Current7.5A


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