2. amps-preamps
  3. 173415-7783

Help with McIntosh Repair Facility

My MC452 is having an issue with the right channel that's a little weaker than the left.  Not by much but definitely noticeable.  Have been trying to diagnose the issue and everything so far points to the amp. I'm using XLR and have changed ICs , preamp tubes, cleaned amp inputs, etc.. but the head scratcher is if I switch the right and left IC inputs on the amp the sound or output is balanced. The meters are in alignment as they should be. The only issue is of course the right and left channels are opposite now.   I've spoken with an authorized repair center and bench testing is $350 and worse case scenario the board needs replacing plus labor can hit $2500 which in my opinion is ridiculous.  Has anyone experienced this issue or have any ideas or know of a reputable or more cost effective repair facility? I'm in Lexington KY.  Thanks in advance.  

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jetter
3,057 posts
 

I think hendrixinc has the right idea.  It can't hurt anything and really quick to take off the top and check out the speaker and input connections inside the amp to insure all is ok.  Best to unplug unit before looking about.

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samzx12 OP
1,222 posts
 

Hi Tim, 

 

Thanks for responding.  Much appreciated.  Not sure if you noticed I mentioned when I put another amp into the system all is well.  I placed a MC402 in over a week ago and it sounded perfectly balanced so this tells me the issue is more likely the amp.  Wouldn't you think so?  I'm going to put some RCA interconnects in soon and see if this solves the problem.  Hell I've switched and substituted every other cable in the system and the issue doesn't go away. I'm inclined to think it's something relatively simple with the XLR input on the amp. I've also cleaned with Deoxit the XLR inputs on the amp and it didn't help.  

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samzx12 OP
1,222 posts
 

Jetter great idea. Thank you. 

fiesta75
1,378 posts
 

+1 oldhvy - He's a Mac expert.

mntyh
4 posts
 

I live in Kentucky,got a good contact. He's retired now but,he might have some suggestions. The bottom cover may need taken off and check the terminals. My MC 500 got a little lose. How long has this been happening. Do you disconnect it often?

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