This 2 valve TRF* receiver was originally built by an enthusiast in the 1920’s and would have been powered by a glass accumulator for its L.T. supply and other batteries for its H.T. and G.B. supply. It has been fully restored and renovated and been wired up to work using a modern power supply and batteries for demonstration purposes.
*T.R.F. (Tuned Radio Frequency) receiver was among the first designs available in the early days when means of amplification by valves became available. The basic principle was that all radio frequency stages simultaneously tuned to the received frequency before detection and subsequent amplification of the audio signal. When a radio station was detected it was necessary to use a reaction control to adjust the RF level to prevent overload and the receiver going unstable.