Zoccolo Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Udb) Utilizzata per Radio/TV-reception etc. Filamento Vf 6.3 Volt / If 0.45 Ampere / Indirect / Specified voltage AC/DC Bibliografia Taschenbuch zum Röhren-Codex 1948/49 Babani, International Radio Tube Encyclopaedia Universal Vade-Mecum, Electron Valves and Semiconductor Devices