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K40D

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ID = 39994
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Ballast Tube (neither FeH or Urdox) 
Identical to K40D

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 40 Volts / If 0.3 Ampere
Description used in Ferguson 7339A. 
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Just Qvigstad
Usage in Models 1= 1940?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
 

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