[R-390] 3MC issue updated

[Steve Quinn]

I posted this a while back, when I shift to 3MC I hear signals then they fade 
but not all the way out.

OR I hear signals for about 30 secs then the band goes dead, dead as a door 
nail.  I have cleaned the xtal and it worked when I put it in my 75S-1

Question:  are the R390A xtals different from the other xtals used in other 
Collins?

I have heard from all to clean this or that, well this unit was taken apart and 
everything was refurbished but the dang 3MC and the related 20MC don't want to 
play nice

Thanks

Steve Quinn