I used Vintage Amp Repair for a Threshold preamp I own, he did a good job at a fair price. Jon Soderberg is the owner, his number is 916-721-9611.
Theshold Amp repair
I have a Threshold S500e amplifier that has gone kaput. Does anyone know of a Threshold repair company, since they've gone out of biz? Please e-mail or post response. I live in Los Angeles, CA. On a related note does anyone know where I could find some 32Volt 6amp fuses? Tried local Radio Shack, Home Depot, Marvac and specialy electronic shops...all treated me like I was looking for Holy Grail.