This source for 50 W amplifiers per channel was found in 1967 Delco documentation. Transistors are from that time, difficult to obtain today.
September 2016 - It can be purchased from Mouser Electronics the new rectification controllers...
The frequency of this oscillator depends on the capacitors, being able cover the range between 1...
The circuit is from a June 1995 Electronics Now. The relay is power-dependent and both R1 and R2...