I have just bought a 2nd hand PPP. The guy who sold it to me, showed me a little screw underneath the cabinet, which he used to calibrate the output voltage.
I have used this screw to adjust the PPP as I came home. From I think 232V to 230V.
Yesterday I switched the power of in my house. The stereo system was switched on – I forgot about it. When I switched on the power again in the house, all the fuses blew, in my power amp, CD player and my electrostatic speakers. The PPP however was not effected – it still works.
Have I in anyway put the PPP out of adjustment, by using the little screw…??