For the time being, pictures of a Jennings Organ Company organ power pack and "50-Watt Amplifier" that came up for sale c. 2014, saved from the wreck of a console organ.

The power pack provided stabilised voltages for the various circuits (generators, oscillators, vibrato, and so on); the amplifier amplified the resultant signal. More will be said about the various elements when the circuit diagrams are ready for posting.

The valves in the amplifier are: 6X5 rectifier; GZ34 rectifier; two EL34s; and a 6SN7 phase inverter.

The valves in the power pack are: GZ34 rectifier; 6CD6 power valve; and a 6J7 and GD100A (= Mullard 7475) as voltage stabilisers, the latter neon.

Power pack at the top of the picture, amplifier near field.

Amplifier, Haddon mains and output transformers, and choke.

Amplifier chassis from above

Amplifier, under chassis.

Power Pack

Power Pack, under chassis.