Don't know about your area but I would contact Jon Morris in Wyoming if you need to service your Adcom, I purchased a rebuilt 545 from him which is just spectacular
PM me if you want the details
Adcom GFP-555 II
I have had this pre-amp for maybe 30 years paired with two GFA-555s the input/listening switch has static into the left channel intermittently and needs to be wiggled back and forth to eliminate the static. Is this easy to replace? Need soldering to replace? Does anyone know of a good repair shop in the Phoenix area?