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MDK21

Information - Help 
ID = 67598
       
Country:
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  OCTODE   Frequency converter   Controlling (mu) 
Identical to MDK21 = DK21

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 1.4 Volts / If 0.05 Ampere / Direct / Battery =
 

Usage in Models 2= 1941 ; 1= 1947

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

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