One thing I did notice is that Channel 1 loops through Channel 2. Tracing the output of Channel 1, i see that it feeds into pin 6 on the IC on Channel 2 via a 220K resistor. I completely eliminate Channel 2 contributing to this issue, I jumpered the output of channel 1 directly into the power amplifier board essentially bypassing Channel 2 altogether. I still get the hiss...so it is definitely from channel 1.