After more than half a century things get dirty. With the lid still off the HR-10 receiver I made a cleaning effort of flat surfaces inside. I used alcohol and a cloth. I hope that will also reduce the smell. I carefully pulled each tube and gave each hole in the tube socket a drop of contact cleaner. Just to reduce the risk of hard to troubleshoot problems.

Also, in the “an ounce of prevention” strategy I planned to loosen all ground lug nuts and treat them to some of that contact cleaner. Until I realized there is no such thing as a metric nut in this unit. My toolbox is wanting on nut drivers.

I tightened the set screw on the band switch. Now it feels much better.

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