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ID = 20563
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: Amperex; New York 
Tube type:  Double Triode   Universal 
Identical to 7308 = E188CC = CV4108
Similar Tubes
Multiple differences or of other kind:
  6922 ; 6922WA
First Source (s)
27.Jun.1960 : Electron Tube Registration List 2858
Predecessor Tubes 6922  

Base Noval, B9A
Filament Vf 6.3 Volts / If 0.335 Ampere / Indirect / Parallel, (AC/DC) /
Description Premium variant of 6922. Low microphonics, 10.000-hr life; heater current increased to 335mA 
Tube prices 3 Tube prices (visible for members only)
Literature Röhren-Taschen-Tabelle, (Franzis RTT)   
- - Manufacturers Literature   
Tube Lore

7308: Private collection
Emilio Ciardiello

7308: RTT Schwandt
Günther Stabe

7308: Siemens Röhrentaschenbuch 1972
Michael Schlör

Usage in Models 2= 1960?? ; 1= 1963

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

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