You can find schematics for the 350-B, C, & D at
HHScott.com. You MIGHT also be able to find a manual at the same site, via
this link, if you have Java Runtime Environment installed.
My problem is that I don't have enough neutral between the tuner and my DAC. They're somewhat close together but not so much so that I could have envisioned this to be a problem. So what to do; disconnect the DAC interconnects at the back of the amp and the volume increases exponentially.
I have no idea what the first two sentences mean, but it sounds like the input select function of the integrated amp may have a problem, and is shorting the inputs from the two sources together.
Regards,
-- Al