You could ask McIntosh.
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All of the above responders gave you good advice. However, that model always had trouble with their meters. Mine used to intermittently quit working. As I stated in another post, there is a vertical circuit board directly behind each meter that is removable. Pulling the board out and pushing it back in helped, but occasionally occured again. My opinion is that there is some inherent problem with this model and it's meters, as you're not the first guy to make this complaint. My problems occurred over 30 yrs ago when I owned it, so this problem of yours is nothing new. My 2 cents worth, anyway.
Thanks everyone for the helpful advice... I called a Terry with DeWick Mcintosh repair and he was VERY helpful. He mentioned it could be one of the 6 the integrated circuits on the vertical board behind the meters referenced above (is this the driver board or meter board?)
I was thinking I could swap those 6 IC's out fairly easily if none of the other suggestions pan out with success. Does anyone happen to know if the IC's are surface mounted (soldered) or are they pinned? I want to go ahead and order some so I have them handy when I take it apart. That beast is too heavy to move around and open up just to peak at a circuit board if someone already knows the answer :)
Thanks everyone for your helpful suggestions!
If the amp is at least 10 years old they are probably not SMD's. However, if you are not well versed in soldering you can easily damage the circuit board traces. I suggest you let a service professional handle that for you. You can also damage the IC's themselves by overheating them. Maybe you can pull the boards out, and if he has a way to test them, send them to Terry and have him do it.