[Milsurplus] Hum

[Rick Brashear]

I have a 60 cycle hum in my BC-614-E that has me scratching my head.  
All filters, chokes, bypass caps, line filter caps, etc. either check 
good or are new.  It seems to be a shielding issue.  When out of the 
cabinet the hum is very loud, however, when I put it in the cabinet the 
hum is almost gone.  I have double and triple checked all grounds and 
they are good.  Has anyone encountered this with the 614-E?  What am I 
overlooking?  I know it's something starring me in the face, but I can't 
seem to see it.

Thanks for any advice you can offer.
Rick/K5IZ