McIntosh (MC601) amplifier overheating problem


Hello everyone - A buddy of mine has MC601s that have recently started overheating.  Each amp went into protection mode after emitting a burning smell, and both had to have an output transistor replaced (at different times).  

My internet digging has revealed that ThermalTrak transistors are not very reliable, or at least the early batches were not.  Ayre has also reported overheated MX-R amps with the same problem.  They apparently can fail after years of use, which is not good news for owners!

I'm trying to get a feel for how widespread this problem may be (at this point in time)?  Each transistor replacement is $400, and there's an awful lot of output transistors in MC601s...!!  I convinced my brother to also get MC601s so I'm starting to get really worried his will fail too in the near future.

So far, McIntosh's response to my inquiry has been vague and reticent, unlike Ayre who apparently went to great lengths to remedy this issue for their owners.  Has anyone out there had this problem with McIntosh or Ayre?  

aball
McIntosh has finally arrived at a decision, after a month of back-and-forth, and it isn’t nearly as good as Ayre’s unconditional warranty for the same issue: they will only pay for parts in the form of built-up heatsinks. My buddy feels this is an ok solution, but it will probably still cost him $400 in labor, plus shipping. It’s a shame - their literature says their amps "last a lifetime" but then they don’t stand by them like Ayre does. Apparently McIntosh isn’t quite what they used to be. Oh well, that’s the way it is, lesson learned, moving on.

If your McIntosh amps overheat in the near future, I hope they will accord you the same offer, but you might have to fight for it as I did.  I wish you all the best in that endeavor. 
I had issues with McIntosh a few years ago with warranty.I will never buy their products again.Their customer service reps on the phone were as rude as it gets.
Wow Arthur, sorry they busted chops!  Not matter how big your only as good as your last customer.  Senior management at Mac would do well to better remember that.  Business can be fickle.  
don’t leave because of one bad apple.....on balance the rest of us on this thread try to help

i can say VX-R twenty very special amp......bit of a beast to lift, it is hyper dense....

i replaced it with purpose built monoblocks designed to only drive tge speakers I have....but i can say it is one sweet sounding SS amp....

good luck