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PL-4D21

Information - Help 
ID = 57009
       
Country:
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):
  PL-4D21A

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_1~~1.jpg
PL-4D21: Götz Linß
Götz Linss

 
pl_4d21_so.png
PL-4D21: ARRL Handbook 1972
Michael Schlör

 
pl4d21_spec.png
PL-4D21: Manufacturer's Literature
Anonymous 15 Collector



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