I have a really weird system issue and I thought I would turn to the experts here before asking anyone else…
I have owned a BHK-250 for about 2 months now(which I LOVE) . It is part of almost an entirely PS Audio setup (the preamp is a W4S unit though I hope to buy the BHK preamp soon). I don’t listen that often, mostly because I like it loud and I need the family to be out of the house. If I think I am going to use it during the day I will turn everything on about 9 AM. Sometimes I play a CD at low volume until I am ready to listen critically (once the house is empty), sometimes everything is on but no music at all is playing.
If I listen in the first 1-4 hour after turn on everything sounds awesome. Many times I’ll use it for an hr between Noon-1 PM and then again at 4 PM. Quite often that 2nd session is a disappointment. I have found that after everything has been on for 6-8 hrs the system constricts and I lose a lot of the higher frequencies and air around the instruments. If I turn everything off and listen again the next morning it’s all back to normal. I had experienced this previously with other equipment when it had been on and playing for many days straight when I was breaking in cables or tubes, or equipment, etc. Someone I trust told me that certain electronic parts do indeed change, i.e. sound different if left on an in use for many hrs or days. I’m just surprised it’s happening to my system now when it’s on for 6+ hrs.
The only other thing I can think of it tends to happen more toward late afternoon (though not exclusively) when there are more homes drawing/corrupting the power grid.
I am baffled.
Thanks in advance.
P.S. I am a 40 year audiophile, just wanted to get that out there lest anyone think I am some crackpot newbie.