at the moment I have 4 Adcom amps running in various application (sound, tv, outdoor speakers etc.).
some were bought new 20-30 years ago, some where bought off craig’s list. None of them have given me any trouble, all of them sound much better than they should for what they cost. Many don’t like separate pre/power amps but if you can live with that, a GFA535 and a 450 pre-amp doesn’t take much space, can likely be found used for 300-400 dollars and is apt to sound better than just about any receiver you could buy for 3-5x the price. ‘Great stuff, built like a tank.