I purchased a used, first generation McIntosh MC275, one which had a "hard life" before I purchased it. As a poor college student, I could not afford the repairs it needed and ended up taking a bit of a loss selling it "as is". To afford the MC275 purchase I sold my pristine MC225 amp.
Your single most significant purchase mistake?
Your most significant regret for having bought? Big expectations and an even bigger letdown? The one you kicked yourself the hardest for ever having bight