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Pioneer SX 690 suddenly stopped working

I have an old Pioneer amp which last night decided to stop working. I can hear the radio tuner very very faintly but it appears to have died.

Being just 35 years old (!) is that it, or is there something i can do to bring it back to life?

Thanks for any suggestions

Pioneer SX 690 suddenly stopped working

Could be a bad regulator transistor. Is the sound you hear through the speakers or headphones? Did you remove an equalizer (then the pre-amp out--amp in jumpers will need to be installed).
You should check the tape monitor switch also (turn volume down first!)