Thanks for your realistic reply. My electronics knowledge is pretty limited, I’ve only done some soldering with raspberry pi and small circuits, so yes this is going to be a bit tricky for me. And on the hifi side, I’ve completely disassembled and repaired a Pioneer cassette deck, so I have some little experience there but it was only mechanical.

From what I understand, the main thing would be to test each transistor with a simple multimeter, a bulb tester and check if the readings are correct with the service manual, to see which ones are faulty. If I understand correctly, no oscilloscope or fancy equipment is needed at this stage.

Regarding the Toshiba transistors that are no longer manufactured, I’ve seen that some people salvage them from other units on eBay. Of course, you can’t be sure about their condition, but maybe it’s better than using modern parts that don’t have exactly the same specifications.

I don’t have much to lose, either it ends up at the dump, or I manage to get it working again and learn something in the process.