First time posting. So I have the following system - Bob's ST120, Roy's SP12 + PH12, Rega RP3 with a Dynavector 10X5 and groovetracer subplatter upgrade. A pair of Paradigm studio 100's, and a Dynaudio sub250. With my old cartridge and previous bookshelves in place, I was fine running the SP12 + PH12 in low-gain mode, but now I can turn the volume up all the way and still want it to be just a tad louder. There's no distortion at all though. Still sounds very nice at full volume in low-gain mode. So I unplugged the preamp, opened it up and moved the jumpers into the high-gain position, plugged it back in and let it rip. When I turned up the sound a bit more than I had done previously (still no distortion) the left channel cut out completely, then with a little static came on a bit static-sounding and then off completely, then I turned everything off. Here's the other thing, sometimes when I use the preamp's master volume nob while music's playing I get static when I turn it each notch. I'm not sure, but the left channel going in and out may have corresponded with me turning the volume nob on the preamp. So, I put the preamp back in low-gain mode and, no real problem (except for the occasional static when adjusting the volume.) Just now I put it back in high-gain mode and it's fine, except for the occasional static when changing volume. So, any idea of what is going on here and how to fix it? Please dumb down your answers as much as possible as I know zero about electronics.
Thanks in advance, love the power amplifier and preamp!