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ID = 57009
United States of America (USA)
Brand: Penta Laboratories; Chatsworth (CA)
Developer: Eimac (brand name) 
Tube type:  Transmitting Tetrode, air cooled   VHF 
Identical to PL-4D21 = 4D21 = 4-125A
Similar Tubes
Other characteristic (electr. data):

Base Top contact with a cap.
Filament Vf 5 Volts / If 6.5 Ampere / Direct
Description This is just the 4D21 with the prefix of the manufacturer, PL = Penta Labs 
PL-4D21: Götz Linß
Götz Linss

PL-4D21: ARRL Handbook 1972
Michael Schlör

PL-4D21: Manufacturer's Literature
Anonymous 15 Collector

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