Call Brooks Berdan, who is a Quad dealer...he may put you on the right track...626-359-9131
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You have an option in Campbell, CA with Nick Gowan owner of True Sound. He repairs Quads, is quite knowledgeable, does excellent work, and is a class guy.
On the east coast, there is QS&D. They are an authorized Quad Service Center and yrs ago was the Quad importer. They do excellent work and have the quickest turnaround for repairs that should get them into the High End Hall of Fame.