This receiver was found in a Popular Electronics from the 90's. Its different configuration shows a tuning circuit after the tube that works as an aperiodic amplifier. Observe supply voltages.
This power control circuit was found in an article in the June 1995 Electronis Now magazine. The...
This circuit was obtained in a 80s RCA documentation. The circuit uses components from that time....
This circuit compares the input voltages by providing an output according to the curve next to the...