re capping

I am restoring my highly Modified Old Sumo Nine right now, It took a lightening strike a few years ago and I have missed it. In 1983, we put what at the time was a very nice Panasonic electrolytic in the power supply, they were an 85 degree part. It was never turned off for most of those years. While repairing this amp, I figured why not, while its open, I’ll replace the caps... I found nice caps with double the capacitance and lower esr to replace them.... The point is, To my surprise, we measured the old Panasonic caps. their values across the board were still in spec. You just don’t know. My experience has been, that when caps sit without a charge, that is when the tend to dry out. I have never had a cap failure and I do not EVER turn off my solid state gear. (when I owned tubed gear, it was always turned off after each use). I have always been under the belief that it is the charging and discharging caps that is most damaging to them. 

My experience has been, that when caps sit without a charge, that is when the tend to dry out.

They dry out more when amp is powered because they get hotter.  I replaced supply caps in Cambridge amp and bass definition improved greatly.

@timlub 

You've clearly never owned a class A solid state amp. Your anecdotal "evidence" makes no sense. Your use of commas makes no sense either. Unless you measured the leakage, capacitance, and ESR, you don't know anything about their condition. I just had a power supply fail a couple days ago because some idiot stuffed a big, cheap cap right next to a hot diode. Made the thing chirp like a bird. 

@kosst_amojan     Very nice of you to put it that way to me... So, I've clearly never owned the PURE Class A amplifier that I just referenced that I am currently rebuilding?  I am changing the 85 degree caps to 105 degree caps, but I haven't shoved any big cheap caps next to hot diodes. I hope that can be repaired for you.  I guess since it is "My Experience" you could call it anecdotal, but either way, it is 100 percent true.  Is it ok to use to many periods......  or is it just commas that are the problem? And yes,  ESR and Capacitance were both measured.  I saw no reason to measure leakage current since there was no loss of ESR or Capacitance, all caps looked great..... 
I am ok with others having more knowledge about amplifiers than I do.  I am a speaker guy,  but I still do not belittle people about what they might not know about speakers. 

@timlub 

Why on Earth would you leave a class A amp on all the time? I leave my F5 on for a week and my power bill goes up noticably. Heat destroys caps like nothing else. If you don't think so, why bother with high temp caps that certainly have inferior specs to standard temp caps?