Mainline switches [resolved]

[Paul Birkeland]

If the amp is working, I would leave it alone.  If you go in and start replacing wires, you're introducing the possibility that new problems are created.

Yes, the AC transformer voltages will decrease under load.  What is your powerline voltage and which wiring configuration for the power transformer did you use? I would imagine maybe you have something like 225V AC of powerline voltage and your amp is set for 230V nominal, which would be a situation that would predict the loaded AC voltages you see, and there's nothing out of the ordinary about that.

 

[bergurbrag]

Thank you for your advice. I live in a country with 230VAC mains. I have measured the voltage going in to the transformer and it is 230VAC.

I used a configuration for Greater than 225VAC and Less than 235VAC

I measured the diameter of the stranded one again and it was really bad. I could not leave it....
I went a head and changed the wires to the one I mentioned earlier, the one with a drain wire and foil shield. It improved the voltage read under load a little bit.
Before re-wiring I measured the transformer, with no load, and it was 140,7VAC and 9,5VAC

Thank you again for responding fast and professionally ! I appreciate it very much

 

[bergurbrag]

... and, yes, the amp still works beautifully