| Base | Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Up) |
| Filament | Vf 1.4 Volts / If: 0.05 Ampere / -: Direct / -: Battery = / |
| Description | Glass octal type used as combined detector and amplifier in battery-operated receivers. Filament 1.4 volts, 0.05 amperes. Characteristics of triode unit as class A amplifier. Diode is located at negative end of filament. |
