This amplifier was found in a tube equipment manual from 1947. The high-fidelity circuit has pentode tubes at the output and a source with transformer.
Indicated for vinyl media recovery, this circuit is from the 80's, having been found in an...
This levitation circuit keeps a small globe floating in space under the action of a magnetic...
This frequency-corrected 1 kHz circuit has a nearly perfect rectangular signal. The circuit is...