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QP21

Information - Help 
ID = 16232
       
Country:
Great Britain (UK)
Brand:
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Double Pentode   Power/Output 
Identical to QP21 = VR35 = QPT2
Similar Tubes
Normally replaceable-slightly different:
  240QP
First Source (s)
22.Nov.1935 : Wireless World (The), London (WW, 79)
Successor Tubes CV1035  
Base British-7-Pin, old (M7A) (Codex=No)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.4 Ampere / Direct / Battery =
Information source The Saga of Marconi Osram Valve   p. 26, 148, 333
History of the British Radio Valve to 1940   p. 148 & 188 & 188
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49
uk_qp21_ckt.png
QP21: Mfg. data sheet
Jay Kinnard
uk_qp21_base.png QP21: Mfg. drawing
Jay Kinnard

Just Qvigstad 		qp21_spec.png
QP21: Marconi Advertisement
Anonymous 15 Collector
Usage in Models 6= 1934 ; 3= 1935 ; 1= 1936? ; 3= 1936 ; 1= 1937? ; 4= 1937
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):18
Literature "History of GEC and the Marconi Osram Valve"

Collection of

Robert Gillespie (USA)
Pedro Prieto-Castro (E)
Jose Luis Villabona Horreo (E)
Frank Cuffe (IRL)
 
qp21_2.jpg

QP21
 
Forum contributions about this tube
QP21
Threads: 1 | Posts: 2
Hits: 1876     Replies: 1
wrong tube type
John Koster
23.Dec.16 		  1
wrong tube type 

This is a pentode, not a triode...
Otmar Jung
23.Dec.16 		  2
wrong tube type 

Thank you for the hint.
 
QP21
End of forum contributions about this tube
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