Scott,
I know this is cold comfort, but like Roxy54, I have a SET amp - same one, the Audio Note Kits Kit 1) and it's dead quiet, no hum at all. So you certainly should not be getting any hum with this amp, at least not because it's single ended.
I know first hand that problem solving can be tricky and frustrating but you'll figure it out and, as Coincident's customer service is said to be first rate, I've no doubt they'll stand behind you.
FWIW, I had a nasty ground hum for years in my analogue side that I was certain must be due to a problem with my Bottlehead Seduction phono preamp, which I also built from a kit. Turns out that the problem was a broken ground wire in the tonearm cable of my turntable. Local service tech fixed it and tightened up the tonearm and now the hum is completely gone. So, try to be both patient and persistent!
I know this is cold comfort, but like Roxy54, I have a SET amp - same one, the Audio Note Kits Kit 1) and it's dead quiet, no hum at all. So you certainly should not be getting any hum with this amp, at least not because it's single ended.
I know first hand that problem solving can be tricky and frustrating but you'll figure it out and, as Coincident's customer service is said to be first rate, I've no doubt they'll stand behind you.
FWIW, I had a nasty ground hum for years in my analogue side that I was certain must be due to a problem with my Bottlehead Seduction phono preamp, which I also built from a kit. Turns out that the problem was a broken ground wire in the tonearm cable of my turntable. Local service tech fixed it and tightened up the tonearm and now the hum is completely gone. So, try to be both patient and persistent!
