I’ve been an enthusiast of the SET 120 from the first day. Got mine used for a nice price. My usual routine is to turn it and the Supratek Chardonnay preamp on at least an hour before critical listening. The best sound is after midnight and after 5-6 hours of use. Some weeks ago, I turned the preamp off, but not the SET 120. I discovered that in the afternoon and just decided to leave it on til listening time at nine.
I was in for quite a surprise with the SQ improvement that night. We can differ on many things like more air, deeper soundstage etc. But I was unmistakably hearing additional individual voices within a chorus and additional instruments as well. I didn’t see anything in the manual about leaving it on all the time, so I emailed Frank. His response was to definitely turn it off each time. While I’m respectful of the manufacturer’s opinion, it just sounds too good not to leave it on 24/7. My Border Patrol SEi dac, iFi Zen Streamer and streamer linear power supply are all on 24/7.
So I’m wondering who else has their 120, 225, 400 amps on all the time. If you haven’t tried it yet, you should consider it. I had been thinking of trying another amp, but the improvement now is like having another amp! 🎶