6AC7 Amplifier (T450E)

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

High impedance amplifier (CB7449E)
Suitable for the use with sensors, this circuit from National Semiconductor appears in other...
Audio Wattmeter (CB826E)
This circuit can measure audio output power up to 50 W. The circuit is wired to the output of an...
6 V x 1 A power supply (CB1157E)
This regulated power supply can provide currents up to 1 A to a load. The transformer may actually have...