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 circuit was found in an old American optoelectronics manual. The circuit makes use of an...
Waking up to a loud and clear sound from an audio oscillator, after up to 5 hours of sleep, or...
We found this circuit in Motorola's 1990 Linear Databook. The component used is unusual. The...