This FM receiver tuning step circuit was found in a 1960 documentation. No information about the coils is given, but the FI used at the time was 10.8 MHz.
In figure we have a three-phase AC motor control for voltages up to 600 V or 1200 V depending on...
This circuit can drive a white LED from a 3 V supply. The circuit is intended to supply White LEDs...
This application of the RCA integrated circuit released at the time was found in the August 1970...