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ID = 4218
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: Bell Labs; Murray Hill, NJ. 
Tube type:  Double Triode   UHF 
Identical to 2C51 = 5670 = 396A = CV2831
Similar Tubes
Normally replaceable-slightly different:
  6CC42 ; 6Н3П
Heater different:
Multiple differences or of other kind:
First Source (s)
25.Nov.1946 : Electron Tube Registration List 542
Successor Tubes 5670  

Base Noval, B9A (Codex=No 41)
Filament Vf 6.3 Volts / If 0.35 Ampere / Indirect / Parallel, (AC/DC) /

This tube appears to be one of the earliest Noval (B9A) tubes, registered on November 25, in 1946, in the Electron Tube Registration List, short after the 12AU7, registered on October 18, 1946.

VHF/UHF medium mu dual triode, usable up to 800MHz.

GE, Hytron, Sylvania, Tung-Sol, WE known manufacturers.

Text in other languages (may differ)
Tube prices 1 Tube prices (visible for members only)
Literature Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore, Sibley, USA 1996

2C51: Own collection
Kazimierz Jarosz

2C51: ARRL Handbook 1972
Michael Schlör


Usage in Models 1= 1950?? ; 1= 1960??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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