• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Thorens AZ 25

very good OT and PT, I have one in a wrecked state on a shelf, he served as an organ donor to save another in better condition.
There are several forums in France and Switzerland that talk about it.
If you don't have any real troubleshooting skills, forget it, this amp is not very well built and doesn't make interventions easy.