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McIntosh MC2152 power amp technical question

My MC2152 suddenly acting up. When I use the XLR input the right channel makes popping sound when power off. To make the situation worst, the sound coming from this right channel is slightly lower compared to left channel which resulted in uneven sounds: left sound louder than right. IF I use the RCA interconnect the sound is fine and no speakers popping noise when powered off. I can settle by using the RCA interconnect and move on but i want to use the XLR input for better sound quality.  

Could it be the XLR right channel input connection defect? Or the electric board holding the XLR right input is defect?  Any technicians here in the community, your inputs would be greatly appreciated.  

thank you in advance for all your suggestions/help. 
kentrent
yogiboy's avatar
yogiboy
5,668 posts
 
Try swapping the cables and see if the problem moves to the left channel!
bjesien
1,292 posts
 
Is this the 70th anniversary amp?  

As suggested try swapping the cables.  Could the problem be with the pre amp? 
kentrent OP
71 posts
 
swapping cable and its move the left: meaning when i switch the cable to left speaker (with the right jack) the problem deferred to the left channel.  Which means the right channel input jack is something wrong. 
kentrent OP
71 posts
 
Yes, this is the 70th anniversary edition.  McIntosh is not very helpful and not backing up their products.  I called and they dont help me troubleshoot, all they want is for me to sent in for service.   I bought it second hand so they said warranty is not transferrable.  
normansizemore
601 posts
 
I used to own a ton of Mac.  Send it in! If it is a manufactured fault they will repair it for free, regardless of how many owners there have been.  If you have to pay for a repair, it will be done right and with a warranty.  Their rates are no more than your local repair shop. At least that has been my experience.  They are awesome to deal with.

N.
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