I'd try calling Brooks Berdan Ltd in Monrovia. Also, Howard at Audio Specialist in Studio City. But, I'd call Brooks Berdan first and ask for suggestions.
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I referred a friend to Audio Specialist for the purchase of a 1970s vintage Kenwood intgrated amp. When I saw the amp at my friend's house after he brought it home, it clearly had not been cleaned, and the volume control was scratchy. This is something I expected would have been done, otherwise why purchase from a repair shop that sells vintage gear?