This is an amplifier circuit intended for modulating transmitters. The 5-tube circuit is from an American manual from 1947. The power supply uses a transformer.
This circuit was found in a Popular Electronics from the 90s. It uses a LASCR which is a photo-SCR...
The shunt type regulators are connected in parallel with the load, deflecting the current to...
This MW receiver was found in a Raytheon circuit manual from the 1960s. Transistors are the first...