I added DPDT on-off-on toggle switches (1 ea ch) and a second set of RCA outs to the Reduction. I wired it with the leftovers from my SEX kit, twisted.
I moved the left C4S ground to the common ground on the left channel toggle, and it all works well. The only other changes were replacing the single 0.01uF cap (19-22L) sourced from BH (thanks your highness) and the 475kOHM 1/8w resistor (22-23L) sourced from Mouser. Although it has the same DALE 4375F designation it is physically larger than the ones originally supplied.
While it makes music with no added noise or hum, I notice a harshness, especially on vocals. It does not seem isolated to the the left channel where the components were replaced. It seemed to lessen slightly with time, but I was also moving from a known harsh recording (reissue of Queen's News of theWorld) to an older pressing of another rock album I am very familliar with. Less harsh but not as easy to listen to as before.
Thoughts?
Thanks,
Karl