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7B8LM

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ID = 8569
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Pentagrid-Converter (Heptode) 
  Ca. 1925 up to 1945 no serial production. For instance only development samples. *****
Identical to 7B8LM = CV883 = VT-208A
Similar Tubes
Other shape (e.g. bulb type):
  7B8
Normally replaceable-slightly different:
  VT-208
First Source (s)
13.Mar.1940 : Electron Tube Registration List

Base Loctal-8, B8G (Sylvania, 1938) (Codex=We)
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC
Description

Metal bulb, loctal base.

 
Information source Taschenbuch zum Röhren-Codex 1948/49   

7b8lm_so.png 7B8LM: ARRL Handbook 1972
Anonymous 10 Collector


Just Qvigstad
 
7b8_awa.jpg

 

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