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.
March 2017 – Mouser Electronics already has the new Texas Instruments INA260 digital current and...
This tester from a 1960 magazine is only for capacitors with insulation voltages above 200 V (110...
This source was obtained from a former publication for valves but also serves for powering common...