6AC7 Amplifier (T450E)

Obtained in MIT documentation, this 4-stage circuit has high gain for small signals. The power supply sources 150 V.

3-Transistor Amplifier (CB18837E)
This amplifier can be used for public-address or other applications. Three transistors of the time...
Bias oscillator for tape recorders (CB7339E)
This circuit was found in a 1967 Electronics World. The circuit uses components of the time that...
Short Circuit Detector (CB11081E)
This circuit was obtained in a June 1987 magazine Hands-On. It is a circuit that indicates on an...