Valvola 5U4GB Zoccolo Octal (Int.Octal, IO) K8A, USA 1935 Utilizzata per Radio/TV-reception etc. Filamento Vf 5 Volt / If 3 Ampere / Direct / Specified voltage AC/DC Dimensioni (LxAxP) incl.pins/tip 44 x 122 x mm / 1.73 x 4.80 x inch Bibliografia Essential Characteristics, GE 1973