I had a Metaxas Solitaire power amp in for repair. Unfortunately the technician has advised me significant damage has occurred , but he was not prepared to conduct repairs , because other repairers have made out of spec repairs , and he is not prepared to work on other peoples mistakes. OK fair enough. He suggested, I sell it to anybody that may want it as a basis for a project. I am thinking of removing the PCB and replacing all the output transistors , capacitors and all other components on the PCB. Any repairs to damaged traces I can conduct once the PCB is clear and cleaned. My soldering skills are adequate , but i don't have clue how to bias the transistors! or any other issues that may arise. Is this project a "bridge too far" for a novice or should I just have a go?
Without a schematic and bench test equipment (scope, spectrum analyzer, DMM, signal generator, power supplies, dummy loads, etc) you would be facing quite the challenge.
Your tech is correct, these amps were notoriously unstable in design, way too fast in bandwidth for their own good, out to 5mhz. When they went up they took half the neighborhood with them. You could think you repaired it all go to turn on, even with a variac and Chernobyl will follow yet again without notice. He advised you correctly to cut your loses and get rid of them.
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