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luvrockin, I have a no.334 dual mono. I’ve had it for a very long time. Actually I bought it new when the no. 334, 335, 336 series was released. I leave my amp on for extended periods. Days- weeks even. Unplug when it rains or to switch equipment or cables. Mine only gets warm to the touch even when I push it.
No way would I leave my 23.5 on 24/7. I would connect those cables to something else to burn in, or, I would burn them in while listening. If you had a tubed REF 6 pre-amp brand new would you leave that on constantly for 600 hours while burning it in? I definitely wouldn't. Most people suffer to the slowing bettering sound of their new equipment while burning it in.
Also, the cables shouldn't sound bad while burning in anyway, and it is interesting to hear the sound get better over time.
My recommendation, is you are asking for trouble leaving a 23.5 on.
I use an old Oppo DVD player to burn in new cables. I run the Ayre IBE disc and a stereophile test CD for the most part. I normally don't like the sound of new cables initially. If the cable is used, it goes into the system immediately.
However my Levinson normally stays powered up most of the time.
I owned a Classe' CP35 and a CP60 Preamp and they did not have a power switch.
Guys, thanks for your input. I actually turned off the amp last night. After a couple hours after this post I felt it's running way too hot, not warm for comfort. Years back, I burned in cables leaving the amp on most of the day and I don't remember anything like this. They must have done something. My dealer is closed today but I will definitely be calling them tomorrow morning.