Metallised bulb. tube allocated British Army type number ARP11 = Army Receiving Pentode
Literatur
Taschenbuch zum Röhren-Codex 1948/49
Babani, International Radio Tube Encyclopaedia Pages 50 & 51
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
ARP11: Manufacturer's Literature
Emilio Ciardiello
Just Qvigstad
ARP11: Manufacturer's Literature
Emilio Ciardiello
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