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VP21

Information - Help 
ID = 10377
       
Country:
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to VP21 = NR41_EN
Similar Tubes
Normally replaceable-slightly different:
  CV1332 ; VP24
Base British-7-Pin, old (M7A) (Codex=Nr)
Was used by Radio/TV-reception etc.
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.

This tube is a variable mu type.

 
Information source The Saga of Marconi Osram Valve   p. 149, & 334
History of the British Radio Valve to 1940   p. 148 & 194
- - Manufacturers Literature
Taschenbuch zum Röhren-Codex 1948/49
156_10.png VP21: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		vp21_spec.png
VP21: Marconi Advertisement
Anonymous 15 Collector
More ...
Usage in Models 2= 1934 ; 1= 1935? ; 4= 1935 ; 4= 1936 ; 7= 1937 ; 1= 1938? ; 2= 1938
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):21

Collection of

Robert Gillespie (USA)
Martin Zavelberg (D)
 
tube_vp21_1.jpg

VP21
 
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