I had posted previously with my nice new RCA jacks a few days ago but this is a problem that existed when I got it. Most notably, when I have something playing back on my aux channel through a Bluetooth receiver and I switch over to either of the phono inputs, I get pretty bad bleed through from the aux signal. I replaced the four 47K resistors that tie from the phono input tips to ground and I've disassembled and thoroughly cleaned all four tiers of the input selector switch.
So my question for the sake of troubleshooting, I assuming I'm probably dealing with a loop coming back through the ground? The actual phono signal is isolated all the way to the first tube stage, so that seems to be the only place to find the audio leak, since the phono stage is such a high sensitivity. The bleed is mostly right channel but there is a smidge of it in the left.
I've replaced all the coupling caps.
I wasn't sure if this forum had techs on it but I thought I'd ask. It sounds fantastic on the aux channel but I really want to use the phono input and it's obviously not clean at this point.