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Pathos Heritage

I just got my Pathos Heritage for my home in the USA, but I am experiencing something I have never seen before; when I first plugged it in with the volume at half it sounded pretty low, kind of scary low for a 80Wpc amp running Avantgrade Duo Mezzo XD speakers or Tannoy Kensington.

After running it for about 100hrs the loudness dramatically increased.

I have owned and own quite a few amplifiers and never seen something like this before.

‘this is REW’s measurements at the first few hours

and here after about a hundred

128x128astolfor
jerryg123's avatar
jerryg123
3,429 posts
 

I know when I had my Pathos InPol Remix it was a good 300 to 400 hours before it really came to life and opened up.

astolfor's avatar
astolfor OP
317 posts
 

I hear you, I am more interested in understanding what electrically could have happened that the amp almost double SPL gain. I can't think of an electrical reason.... I understand that sound will open up and get a given signature with time but gain? It has never happened to me and I have  and had own quite a few amps.

blackdoghifi's avatar
blackdoghifi
45 posts
 

That is well beyond what break in should be. This is a problem.

I have never seen behavior like this, but one thing comes to mind. Do the tubes all light up properly?

Also what happens when you shut it down?

.

runwell
279 posts
 

Tube might be the problem. 

If you can not check the tube, use the new matched new tube to try .

astolfor's avatar
astolfor OP
317 posts
 

Tubes are good, I measured them and tried a new pair. 

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