mcintosh told me on my mc-402,one hour,only piece in soild state,running all tube gear with this system,can tell after 40 minute's sounds real nice,,,,,,,,,,,,,,
How long it take before your system/amps sound
...the best. My system sounds the best after 12 hours of playing. I didn't realize this until I inadvertently left my system on overnight. I was surprised how much better it sounded compared having the system on for an hour or two. I have tube DAC and amps, which probably are the reason for long warm up. His really surprised me.