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ID = 10377
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Vacuum Pentode   Controlling (mu) 
Identical to VP21 = NR41_EN
Similar Tubes
Normally replaceable-slightly different:
  CV1332 ; VP24

Base British-7-Pin, old (M7A) (Codex=Nr)
Filament Vf 2 Volts / If 0.1 Ampere / Direct / Battery =
Description Va<150, Vs<60. Gm=1.1mA/V at the max voltages and Ia=2.8 with -Vg=0. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
VP21: MZ
Martin Zavelberg

More ...
VP21: Telefunken Werkstattbuch
Wolfgang Bauer

VP21: Marconi Advertisement
Anonymous 15 Collector

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from Just Qvigstad

Usage in Models 2= 1934 ; 2= 1935 ; 1= 1936? ; 4= 1936 ; 7= 1937 ; 1= 1938? ; 2= 1938

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):19

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