Probably a Carver pre-amp back in the 90s. Someone here wisely advised me to lose it and I did and it was a new day dawning.
Carver amp was fine applied properly. Still have Carver tuner. Still very nice!
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