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4A1

Information - Help 
ID = 21251
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Ballast Tube (neither FeH or Urdox) 
Identical to 4A1 = CV821

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Filament
Description 300mA, 4V drop. 
Information source Ballast-Tube Handbook; Jacobi 1985   

0_ball_6_36.png 4A1
Emilio Ciardiello


Just Qvigstad

Collection of

 
4a1_sylvania_p01_s.jpg

4A1
 

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