The amp has been great so far. Zero issues with transformer buzz and the tubes have been perfect, no issues or noise at all. I currently have connected to Klipsch Cornwall IV speakers and it really sounds great. it does improve with long break in time. It smells toxic , strong oil smell for about 5 days, the smell goes away. It exceeded my expectations and I am keeping it. if you have efficient speakers this may be the best value in tube amps out there. really happy with it.