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My GFA-535 was problem-free for the 10+ years I relied on it. That said, there are Adcom amps that are notoriously failure-prone and so difficult to repair that technicians often have resort to aftermarket PCBs in order to bring them back to life and into spec -- so maybe we've just been lucky.Only checking - setting bias and offset. No soldering.
Adcom GFA 585 Part 1 (of 3) - First Look
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