amplifier longevity

I have and use 3 Adcom amps - GFA 5802, 555, 2535 that still work great. No problems or recaps. Only had one amp ever go bad, a Carver cube amp .

Re: the comment on Counterpoint Mosfets and heat It’s common practice for TO3 devices, mosfet or bipolar, to be covered by plastic covers.  They are there to prevent law suits when people get zapped by the + - rails voltages.  The heat of these devices are dissipated by conduction to the aluminum chassis via the silicone pad.  There’s absolutely no issues with that approach to mounting and using QCovers. 

Terry 9:is corr3ct heat is a destroyer that’s why good electronics have them well ventilated,they only thing that don’t mind heat all digital clocks .

@johnsonwu  as you know, like you I have been repairing Counterpoint components for some time now.  While it was a common practice and there for a reason, I have also seen many covers with holes so the heat does not get trapped.

While it may not be the single cause of failure, IMO and from repairing about 50 Counterpoint power amplifiers, I would suggest that the covers while providing a benefit, are not optimal for heat dissipation.

YMMV

Happy Listening.

32 year old NAK PA-7A MKII & CA-7A pre here.

Both checked out by ex NAK tech early this year. They're in A+ condition.

Caps are in great shape, and tech says you couldn't buy better ones even now no matter what you spent.