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Apt Holman repairs

I own an Apt Holman preamp, circa 1980, designed by Tom Holman. There used to be a few highly reputable repair companies that upgraded some of the components in these preamps, along wtih performing expert repairs. Does anyone know of any such companies?
acadia

Showing 1 response by tots

tots
26 posts
 
Just from searching (since I have the pre-amp and amp), not from experience)
https://audioproz.com/AP.php?Article=64https://audioproz.com/AP.php?Article=95
https://quirkaudio.com/?page_id=895https://quirkaudio.com/?page_id=952https://quirkaudio.com/?p=936
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