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PenA4

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ID = 11479
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Vacuum Pentode   Power/Output 
Identical to PenA4 = 7A3 = OP42
Similar Tubes
Normally replaceable-slightly different:
  42MP/Pen ; A70D ; AC2/Pen ; N41 ; PT4 ; Pen4VB
Other base and data slightly different:
  AL3
Base British-7-Pin, old (M7A) (Codex=Ndo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 2 Ampere / Indirect / Specified voltage AC/DC
Tube prices 1 Tube prices (visible for members only)
Information source History of the British Radio Valve to 1940   p. 150 & 190
Babani, International Radio Tube Encyclopaedia   p. 128 & 129
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49
pena4_sock.png PenA4: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

Just Qvigstad 		pena4_techdat01.png
PenA4: Mullard Valves 1936
Peter Hoddow
More ...
Usage in Models 1= 1932? ; 2= 1935?? ; 3= 1936? ; 37= 1936 ; 5= 1937? ; 20= 1937 ; 1= 1938? ; 19= 1938 ; 3= 1939
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):91
Museum "Wireless In Wales Museum"

Collection of

Howard Craven (GB)
Collection of a member from D
Patrice Zeissloff (F)
Frank Cuffe (IRL)
 
pena4.jpg

PenA4
 
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