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4C25

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ID = 39384
       
Country:
United States of America (USA)
Brand: Heintz & Kaufman Ltd. (Gammatron); San Francisco, CA
Tube type:  Transmitting Triode, air cooled   VHF 
Identical to 4C25 = 54 = Gammatron_54
Similar Tubes
Normally replaceable-slightly different:
  3B/501A ; CV49
Different maximum ratings:
  35TG
Base UX-Base (4 Pins (2 thick, USA 1924, UX) Sidecontact and top contact.
Was used by Transmittertube (Radio)
Filament Vf 5 Volts / If 5 Ampere / Direct
Description

VHF transmitting triode. Thoriated tungsten filament. Grid and plate pins.
50W plate dissipation, 3KV max plate voltage at 150mA max, gain 27. Up to 200MHz max full-ratings operating frequency.
Tantalum plate shows dull cherry red color when operated at 50W.
Heintz & Kaufman, Hytron and even STC, as 3B/501A, known manufacturers.

 
Information source Tube Lore (I)   
- - Manufacturers Literature   
Babani, International Radio Tube Encyclopaedia
Tube Lore (II)
4c25.png 4C25: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad 		4c25_1_2.png
4C25: Manufacturer's Literature
Emilio Ciardiello
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