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ID = 4703
United States of America (USA)
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to 6C7 = CV854
Similar Tubes
Other class quality (otherwise equal):
Other base:
  6V7G ; 85
Other base and other heater:
Predecessor Tubes 55  
Successor Tubes 6V7G  

Base 7-Pin-Base U7A = small, old, USA (Codex=Ma) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC

Appeared also with (sprayed) metal shield

This tube was made by several US manufacturers and is unique in methods of shielding. Majestic and a few other manufacturers opted for the sprayed a metalized paint. Raytheon, Sylvania and National Union and others used fixed metal shields. Another variety had a stud on the side of the Bakelite base which was connected internally to the no 3 pin (clockwise from the left filament pin). In another variety, there was a pin (about 1.5-2mm diameter) in the side of the Bakelite base which had a wire soldered to it which rad up the side of the base, over the base lip and was connected to no 3 pin. In both latter cases the attachment of the shield was optional. Other similar tubes (6D7, 6E7) also had similar variations 
Dimensions (WHD)
incl. pins / tip
x 108 x 42 mm / x 4.25 x 1.65 inch
Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
-- Collector info (Sammler)

6C7: Internet
Miguel Angel Trujillo-Rodriguez

478.png 6C7: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad
6C7: elektron taschenbuch 1952
Heinz Höger

Usage in Models 1= 1932?? ; 1= 1933? ; 1= 1933 ; 2= 1934?? ; 1= 1936? ; 1= 1937? ; 1= 1938 ; 1= 1940?? ; 1= 1958

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):10

Collection of

Collection of a member from CH


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