Pass Labs XA-25 on all the time?

If u listen a lot, leave on. It is Pass labs.
i leave my. Amps on. A lot. (Mccormack750’s)
conrad Johnson building McCormack amps, these are my grails!!
Love them.
Leave your preamp on, it more harm for on/off every weekend.

leave on. Enjoy!!,


my B&K pro10MC is on about 300/365 a year.  
Preamp warmed up. Is asportmas a warm amp.

hey cooperjack

I own a Pass Labs XA30.8 and I leave it on all the time. There is a reason I do that. Every time I have to unplug my amp or just turn it off for a long period of time I noticed that when I plugged back in again things just didn't sound "right". It's hard to say exactly what didn't sound "right" but I heard it every time. Then it dawned on me.

When you unplug or turn off an amp for a long time it allows the caps and the transformer to completely drain. You do NOT want to do that. I also noticed that when you turned it back on again it took about 3-4 days until everything sounded correct. You have to realize, the Pass Labs amps are pretty much ALL power supply. Mainly the temporal aspect of the music (timing cues) is what was most affected. A lot of people will think you're nuts if you tell them that. If you're worried about your electric bill then shut it off, if you want it to always sound it's best, leave it on. I hear it every time I unplug it. It takes 3 - 4 days for that big transformer and all those caps to fully charge back up again and come up to speed and stabilize. When that happens everything just comes into focus and the subtle timing nuances that the musicians have taken the time to get just right are preserved and audible. It's a fact that music is a time continuum from start to finish. You can definitely hear it. That's why I leave it on all the time.

Scot

the only downside is the electrical usage, but it is probably not much on the XA25. The XA160.8 left on uses the same electricity as three 100 watt older type light bulbs...I just spoke to Pass about his...no harm to amp and it does sound better, so usually only turn it to standby when not listening for a few days...

I'm inclined to leave it on. It does sound better after being on for an hour. After that, I'm not sure it's not just me wanting it to sound better. But, heck there does not seem to be much downside. I've owned a  Threshold 400A since new. I did turn it off because it gets a good bit hotter than the Pass. That practice and time probably contributed to the caps ultimately requiring replacement. Time probably had the larger effect.  Thanks for all the answers. The XA-25 is very special. Larry