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3B2

Information - Help 
ID = 4294
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to 3B2
Similar Tubes
Normally replaceable-slightly different:
  R-3A3

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 3.15 Volts / If 0.22 Ampere / Half indirect / Parallel, (AC/DC)
Tube prices 2 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
- - Manufacturers Literature   
  3b2.png
  3B2: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
 
3b2.jpeg
3B2: Photo of tube from my collection - TS
Tomasz Szczesniak

 
3b2_basediagram.png
3B2: 3B2
Vitor Oliveira

 
3b2.png
3B2: Manufacturer's Literature
Emilio Ciardiello


from Just Qvigstad

Usage in Models 5= 1955 ; 13= 1956? ; 4= 1957? ; 5= 1958? ; 1= 1961??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):28


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