The 6CD6G is specified for line timebase output in VHF television receivers with wide deflection angles and a screen size of up to 17 inches. With 700 Volts on the anode and a peak surge of 6 kV it can operate with up to 15 Watts anode dissipation. The 50CD6G differs only in heater rating.
The 6CD6G can also be used as an audio output beam tetrode. The values given are for single ended use. The data-sheet has more information on its use for audio. For triode connected Class A push pull a pair could deliver 4.8 Watts. As a beam tetrode the pair in Class A are specified for an output of 13.5 Watts.
Peter Farrow has used these valves in an audio amplifier to produce around 50 Watts of audio in a parallel push pull circuit.
This valve can also be used as a series pass element in a stabilised power supply.
Looking along the grid axis. The bright beam plate is easily seen. Sadly the top cap has been lost.
The construction is two sets of cathode and inner grids within the single anode.
The classic envelope is 48 mm in diameter and, excluding the IO base pins, is 124 mm tall.
References: Datasheet & 1040. Type 6CD6G was first introduced in 1952.