Multi Tube Amplifier (T446E)

Obtained in MIT documentation this circuit uses several tubes to obtain a large gain in the amplification of small signals.

RIAA Equalizing Preamplifier (CB4947E)
Indicated for vinyl media recovery, this circuit is from the 80's, having been found in an...
Magnetic Levitation Circuit (CB23792E)
This levitation circuit keeps a small globe floating in space under the action of a magnetic...
Frequency-Corrected Astable (CB25651E)
This frequency-corrected 1 kHz circuit has a nearly perfect rectangular signal. The circuit is...