McIntosh MR78 tuner repair

There is a thread with photos answering your question at audioaficionado dot org slash mcintosh-audio slash 4294-mcintosh-mr78-cleaning dot html.

I think this is exactly what you need.

Perfect! Thanks for the link Kmccarty.

It's really quite easy. I did my mr77 w/o any instructions a few times.

More or less you remove knobs, then the side metal bars, and various screw that hold top and bottom bars that retain glass. You figure it out as it goes. Once apart you will probably have to replace the foam that keeps the lamp light from bleeding. I used the thinnest self adhesive foam from Home Depot or Lowes.

If you encounter noise while tuning the station, the bearings in the tuning capacitors are corroded. They can be sorted out with a contact cleaner like Deoxit- spray into the bearings of the tuning caps and run the cap back and forth a few times.

Ralph, thanks for your good recommendations. Actually just dusty on the inside of the glass. Not sure about the filter capacitors but I'll take a look while I'm in there. No noise while tuning but probably wouldn't hurt to Deoxit the bearings also while I'm in there.