[R-390] Gain drift

[dog]

I think I may have found the erratica. Renee, K6FSB, told me to check 
the Xtal osc bandswitch, he had an EAC that had a problem with that 
switch. So I am digging around looking at the RF deck and I press on the 
circular thing that shows the band numbers on it and lo and behold, it 
get very erratic, just like when I'm changing bands. I can make the gain 
go away or stay there depending on how I mess with it. Anyone got ideas 
on what to check for with that section? Looks like I need to pull this 
RF section out and inspect that area. There always were a few erratic 
issues with tuning each 2nd osc band, and it was not consistent.

Dave