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2B7S

Information - Help 
ID = 49314
       
Country:
United States of America (USA)
Brand: National Union Radio Corp.; Orange (NJ)
Tube type:  Double Diode-Pentode   RF/IF-Stage   Controlling (mu) 
Identical to 2B7S = ER2B7 = G-2B7-S
Similar Tubes
Normally replaceable-slightly different:
  2B7 ; PH2B7

Base 7-Pin-Base U7A = small, old, USA Top contact with a cap
Was used by Radio/TV-reception etc.
Filament Vf 2.5 Volts / If 0.8 Ampere / Indirect / Parallel, (AC/DC)
Description Glass type used as combined detector, amplifier, and avc tube.

Which differences of characteristics between 2B7S and 2B7 ?

Babani's International Radio Tube Encylopedia gives somme different value as a 2B7, but Brans Vademecum 1945 and 1961 gives as electrical equivalent 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
x 116 x 38 mm / x 4.57 x 1.50 inch
Weight 39 g / 1.38 oz
Literature Babani, International Radio Tube Encyclopaedia   
 
2b7~~3.png
2B7S: Fin Stewart
Fin Stewart

 
2b7sreduitdoc.png
2B7S: Babani 1949-1951
Patrice Zeissloff


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