I built one of Shannon's earliest offerings, circa 2002, and it has served me well all these years. I used Hammond transformers and stuck to the parts on the BOM, only change was some hand-picked tubes from Roger Modjeski and those are probably at least 10 years old now too. It was always a bit noisy, mostly 60 cycles, and I could never chase that down. In a living room system it didn't really matter as it didn't intrude on listening. But I'm using the amp in my desktop system now, and it would really be nice to get it a bit quieter. Any thoughts on where to start? It still sounds great.
Port Townsend, WA