I just upgraded my Cary 300SEI. All the upgrades will take 300 hours to break in, partly due to the Duelund Silver Bypass Capacitors. For the first 150 hours, I’m running it 15 hours a day using my tuner and cheap headphones. I’m using cheap tubes for this part of the break-in. I’m not comfortable leaving it on while I’m sleeping.
For the next 150 hours, I’ll put in my good tubes and use my good headphones to just enjoy the music, mostly through my CD player. And I’ll run the burn-in track on my IsoTek Full System Enhancer CD an hour each day. I’ll use the cheap headphones during this time. The IsoTek CD really helps in speeding up the break-in process. I use the 5 minute demagnetization track one a week and it makes a very audible improvement. https://isoteksystems.com/products/full-system-enhancer/
For the next 150 hours, I’ll put in my good tubes and use my good headphones to just enjoy the music, mostly through my CD player. And I’ll run the burn-in track on my IsoTek Full System Enhancer CD an hour each day. I’ll use the cheap headphones during this time. The IsoTek CD really helps in speeding up the break-in process. I use the 5 minute demagnetization track one a week and it makes a very audible improvement. https://isoteksystems.com/products/full-system-enhancer/