This is the power step of the previous circuit. Output transistors must be mounted on good heat sinks. The circuit is from documentation from the 60s.
This circuit with low impedance output and 900k input impedance was found in the October 1993...
This oscillator by Wien bridge is based on stabilization by a small incandescent lamp. The...
Found in a Popular Electronics from the 90s, this circuit has a configuration that has been widely...