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ID = 57006
United States of America (USA)
Brand: Penta Laboratories; Chatsworth (CA)
Tube type:  Transmitting Tube, Pentode, air cooled 
Identical to PL-4E27A = 4E27A/5-125B

Base SPECIAL TUBEBASE in general
Filament Vf 5 Volts / If 7.5 Ampere
Description This is the 4E27A with the prefix of its manufacturer: PL = Penta Labs 

PL-4E27A: Manufacturer's Literature
Anonymous 15 Collector


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