The schematic for this set comes from Jara Krysatec from Czechia and it features an EM84 Magic Eye tube as well as a variocoupler that serves as a potentiometer for the regeneration to the tube. It works surprisingly well and its rotation is controlled by the solid brass knob on the right of the tube. As the smaller honeycomb coil is turned it’s coupling with the larger coil is increased in one direction and reduced in the other. And it adds a lot of visual interest in the radio as well as being very functional. It was wound on one of my winders out of solid tattoo gun wire to about 40µH while the larger coil was wound on another of my winders to 241µH using .026” diameter magnet wire. It and the 365pF variable capacitor beneath the deck create the tuning circuit for the radio. The tube has two blue lights that vacillate as signals are tuned and were used in the old days to assist in tuning to any station. This circuit required a transformer for 125 volt supply and for 6.3 volts for the tube’s heater. A small but surprisingly loud amplifier was included along with a small speaker which makes listening much easier and pleasant. It is controlled with the second solid brass knob.
The cabinet is of tiger maple and the sides were steamed and bent to shape on a special mold and clamped to set and dry. And interior frame was constructed for the sides to attach to and all component locations were mapped and necessary holes drilled out on the top and back plates. The tuning knob and speaker grill were constructed using this same maple and then everything was stained and shaded with lacquer specially tinted by me here in my shop. It was all then finished with several coats of clear nitro cellulose lacquer.
Like many of my radios this one tunes the AM broadcast band and all that is required is a wire antenna and a ground connection. These radios are not extremely high performance models but are a pleasure to listen to and to experience the golden days of radio back in the 1930’s and 40’s.