This excellent 30 W tube amplifier appeared in the April 1963 Radio Electronics magazine that taught how to assemble it. The critical components in our time are tubes and transformers.
This NOR or NO-OR function circuit with a general-purpose transistor can be powered by voltages from 5...
We found this circuit in a 73, magazine for radio amateurs of the 90s. The circuit is passive and...
This Power supply sources from 500 to 1,000 mA according the transformar and was found in a...