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
Sorry for your issues. I have had several McIntosh units over the last 30 years. None have ever failed. I have had a pair of 601's for awhile now driving Revel Salon 2's. They have been perfect even after listening to The Who at concert levels for extended periods of time. As far as questions about equipment, McIntosh has always been very helpful and prompt with their responses. Just my experience. 
I had the same overheating problem with a mc-352.  I have two and run them mono. I bought both used. The unit in question would overheat then shut down.  Then after a few would come back on. While the other would not have any problems with the same input. Eventually the unit made a Burning smell and shutdown for good.
Took the bad unit to a authorized service center in royal oak Michigan. They went through it found what they thought was wrong and reassembled. They then wanted to make sure that they had solved the problem, so they ran the unit for a few days on their bench, and the same problem occurred. It fried again. They went back in and replaced a whole side of output transistors. (I saw the bag of transistors they replaced, it was a bunch).
 The whole process of th repair took almost 6 weeks (evaluation, ordering parts, labor, testing, evaluation, ordering parts, labor, testing). In the end the bill was $650.00.

So with the repair cost of $650.00 and the $2700.00 I spent on the unit I have $3350.00 into a mc-352. It’s not the greatest deal I ever made, but I wouldn’t say that I am unhappy with my purchase. 
Thanks guys for the feedback. 

Yes, Ayre did a great job taking care of this problem.  Wonderful customer service.  I am in the market for a VXR Twenty as a result!

I've had 21 pieces of McIntosh and never had a problem, other than a cosmetic issue with my MC152 front panel.  But my buddy is hurting.

I will keep you posted on what McIntosh decides to do. 
Hey aball good to see you again.  I’m not round here as much anymore either.   Good luck with Mac.  Don’t want to jinx myself but my 501’s have been driving Thiels for years and haven’t broken a sweat yet.  Hope there is an easy solve.