The Amp Garage

Thanks for the replies. I thought that I may have to start working back from the output with the scope, but as I have never used one on high voltages before, I am not confident about how to do this without causing damage to the scope.

After many years of great service my Hi Octane amp seems to have developed a fault, and I am struggling to fathom out what is causing it. I noticed a fizzing distorted sound when playing a bottom E string, which got worse as I increased the volume. I connected a function generator to the output, and...