The 810 / GL810 is a Thoriated-tungsten-filament type vacuum tube used as an AF power amplifier and modulator and as a RF power amplifier and oscillator. It requires a jumbo four-contact socket and may be operated in vertical position base down or in horizontal position with pins 1 and 4 in a vertical plane.
The 810 vacuum tube is also used in commercial and industrial glue machines.
Electrical Data: Heater Voltage: 10 V Heater Current: 4.5 A