First stop is Audio Research. They offer great service for even their oldest models, and sometimes phantom upgrades beyond the model's ending configuration.
If for some reason you do not want to go the factory route, then Bob Hovland in Los Angeles is a great option. I can refer you if you don't have his direct contact.
Phil
If for some reason you do not want to go the factory route, then Bob Hovland in Los Angeles is a great option. I can refer you if you don't have his direct contact.
Phil