The 845 power triode is a radio transmitting vacuum tube which can also be used as an audio amplifier and modulation tube.
Typically, the plate is machined from solid graphite in order to accommodate high power dissipation (up to 100 watts) and voltage.
The gold plating base and feet make better connecting and it has a bayonet mount which can screw up like lightbulbs. This audio power triode has an anode dissipation of 75 Watts and operates with 1250 Volts on the anode.
The thoriated tungsten filament is powered at 10 Volts and 3.25 Amps
It is direct heated thoriated tungsten cathode triode which applied in class A1,Ab1 power amplification.