Hi, just got a Pass xa25. Had it down 2 days. Two things I’ve noticed. 1. It seems quiet. I’ve got 96 dB sensitive Cornalls and I’m having to turn my preamp past 12oclock to get to 60 dB. Also, it is cool to the touch, after being on for hours. Don’t know if these two observations are related or not. I’ve had a Schiit Aegir, 20 w class A, but this seems less powerful.
It is a demo unit from a Pass Labs dealer.
Any thought would be helpful, thank you
It is a demo unit from a Pass Labs dealer.
Any thought would be helpful, thank you
That doesn't sound right and I recommend you contact your dealer.
I have some experience with the XA25 and after being on for a few hours I found it
definitely quite warm to the touch. Its gain is 20dB, apparently a little less
than that of the Aegie (22dB) so I can imagine you turning up your preamp just a bit
more for equivalent volume.
I have some experience with the XA25 and after being on for a few hours I found it
definitely quite warm to the touch. Its gain is 20dB, apparently a little less
than that of the Aegie (22dB) so I can imagine you turning up your preamp just a bit
more for equivalent volume.
Last edited:
Turn it off at rear switch for 10 minutes or so then back on. Bias may have shut down due to a spike or something needing protection. Should definitely get warm though.
IF you contact the Pass Labs factory with a serial number for the piece we can tell you what it should be drawing from the AC mains in terms of current and at what supplied voltage. At idle current draw is essentially bias and is an excellent gauge of the overall health of the amp. However as Wayne indicates this may be a case of the amp self protecting. Typically from a DC signal on the input.
Turned off for 10 min, turned on. It started to get slightly warm after 10 min, turned on preamp, then heard a pop through speakers, and amp went cold.
Now amp is off, planning to turn preamp on first, then turn on amp. Could the preamp be sending something that triggers amp?
Thanks so much for any perspectives, Ted
Ok, turned preamp on first, then amp. Getting warm and has twice the power(volume). Is there anything I should do other than making sure preamp is on first? Possible underlying issue? Thanks, Ted
After leaving amp off 10 min, turned on preamp, then turned on amp. Getting warm now and has twice the power (volume) as when operating cold. Is preamp sending some kind of surge at start up? Any ideas? Thanks,? ted
It is a rule I follow. Preamp first then amplifier and off amplifier first then preamp. Especially if the linestage, preamp, is a tube unit.
It is a tube preamp. Is this ok and acceptable, nothing o need to address? I wonder if powering up from standby mode will trip the amp up?
Thanks so much for all the info! This forum is really helpful for us non-technical people! Thanks, Ted
Thanks so much for all the info! This forum is really helpful for us non-technical people! Thanks, Ted
There are protection triggers for DC, temperature, and overcurrent.
Probably the preamp turn on thump is triggering the DC protection, which it has a
delay that depends on the size of the thump, it either is large or of long duration
(or both).
Probably the preamp turn on thump is triggering the DC protection, which it has a
delay that depends on the size of the thump, it either is large or of long duration
(or both).
Then the Wizard himself, in fact three PL guru's have replied - what service is that, exemplary I say.
Cyclotron.....ok....I can see all three joined 2001 - 2002 ....soon 20 years.....
We should celebrate this with a DIY mono block version of the XA25.......
We should celebrate this with a DIY mono block version of the XA25.......