[TonyJSenior]

Thanks for the tips - next time I get to work on it will check into what you all suggested. One thing I already did try was to remove the wire from the muting switch from the center terminal of the volume pot altogether and the buzz was still there. I didn't really relocate any replacement caps and when I mentioned moving wiring thinking it was a lead dress issue, I basically moved some of the wiring that was close to the twisted filament wiring away slightly (as much as the slack would allow) to see if that would make any difference. Tube shields are on, but I'll try and clean the rims and shield contact points with some fine emory paper. The part I still find odd is placing something metallic near the caps on the volume control increases this buzz.

Hopefully I get some time to get back into it and check it out further. Thanks!