Model B Aerial Tuning Unit
An aerial tuning unit with a variable reaction coil in the base. The cylindrical body is made of paxolin, the switch mechanism is solid brass and it has heavily lacquered brass fittings. The coil windings are protected by celluloid, the fascia panel is removeable and the whole unit is of a high quality. It covers the medium and long wave bands and the range of coverage is dependant on the variable capacitor used across it. It has an aperiodic aerial winding and a centre tapped coil that is switched.
The reaction coil rotates through 180 degrees by turning the top dial on the fascia panel. The R.I. & Varley Tuner catalogue details this unit and gives specifications and example circuits and can be downloaded from the radio literature section.
The advert shown below is taken from Popular Wireless magazine dated October 15th 1927.