Stereo preamplifier (CB8510E)

Found in a 90s Popular Electronics, this circuit is based on a uA739, an unusual component today.

LM381 52 dB Amplifier (CB25276E)
This non-inverting AC amplifier was found in the February 1990 issue of Radio Electronics...
Magnetic Head Amplifier (CB10873E)
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
15W Hybrid Amplifier (CB17493E)
This amplifier, common in 1986, uses a hybrid integrated circuit that can offer some difficulty to obtain...