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55A1

Information - Help 
ID = 18000
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Ballast Tube (neither FeH or Urdox)   Power-supply 
Identical to 55A1
First Source (s)
17.Sep.1935 : Electron Tube Registration List

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Ua)
Was used by Radio/TV-reception etc.
Filament
Description

54.9 V voltage drop at 300 mA. Metal shield similar to that of 5Z4

Registered to Champion Radio Tube Company.

 
Information source Taschenbuch zum Röhren-Codex 1948/49   
Ballast-Tube Handbook; Jacobi 1985   
- - Manufacturers Literature
 
39_pin~~2.png
55A1: Manufacturer's Literature
Emilio Ciardiello

 

from Just Qvigstad

Usage in Models 1= 1935 ; 2= 1937??

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

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