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239A

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ID = 19549
       
Country:
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Tube type:  Triode, vacuum   Universal 
Identical to 239A
Similar Tubes
Normally replaceable-slightly different:
  215A ; 215A_Nissl
First Source (s)
1927 : Saga of the Vacuumtube, Tyne p.295

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Filament Vf 1.25 Volts / If 0.27 Ampere / Direct / Battery =
Description For applications where low response to mechanical shock was all-important. Low noise and microphonic 215A, was intended for condenser-mic. preamplifiers. 
Literature Tube Lore (I)   
 
239a.png
239A: R.O.
Rudolf Osterkamp

 
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239A: KoBi
Konrad Birkner † 12.08.2014

 

Usage in Models 3= 1929??

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


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