This modulator amplifier for transmitters was found in a 1947 American book. The circuit uses an output with 4 tubes connected in parallel and in push-pull.
This QST circuit generates 4 frequency signals according to the crystals used. Transistors admit...
This sophisticated decade of benchtop resistors was found in the November 1989 issue of Radio...
The transformer inf this circuit is a 6 or 9 V unit and diodes 1N4002. The filter capacitor is 2...