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 headphone amplifier using a pickup coil can be used as an extension for devices such as TVs,...
This rapid response amplifier uses an integrated one that is not common today but can be...
This low noise microphone preamplifier circuit was found in American documentation from the 90s....