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ID = 28068
Brand: Common type Worldwide tube/semicond.
Developer: National Union Radio Corp.; Orange (NJ) 
Tube type:  Transmitting Triode, air cooled   UHF 
Identical to 4C27 = E1232 = REL7 = 8026 = CV92 = NT99
Similar Tubes
Normally replaceable-slightly different:
  CV1256 ; CV199
First Source (s)
21.Oct.1946 : Electron Tube Registration List 530
Successor Tubes 4C29   4C28  

Was used by Radar
Filament Vf 6 Volts / If 6.5 Ampere / Half indirect

UHF transmitting triode, micropup shape, external copper anode with brass radiator. Oxide coated unipotential cathode. Two 4C27s gave up to 150 kW pulse output at 200 MHz in grounded-plate circuit. Used in the transmitters of SCR-602A and of SCR-636A. Multiple markings usually found as in the Canadian REL 7, also marked CV92, 10E/CV92 and 4C27.

  • 150 W anode power dissipation with forced-air cooling
  • 50 A typical cathode emission
  • Usable at 600 MHz

During WWII several manufacturers built tubes interchangeable with the British CV92. These tubes came with multiple markings, British, Canadian and US.

RMA code 4C27 was registered to National Union after the war. Also manufactured by Central Electronics Mfrs. Inc.

Information source 15 éve Standard Radio, Ungarn   
Tube Lore (I)   
-- Collector info (Sammler)
4C27: O.F.
Otto Frosinn

More ...
4C27: Manufacturer's Literature
Emilio Ciardiello


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