chiily
PFM Special Builder
Tony, I'm not convinced that the original caps' cans were grounded through their clamps.If you were really picky about aesthetics a little filler and sanding on top would fill the dip prior to priming and painting. With a little effort you could get it looking original.
PS FWIW I’ve clearly not understood the issue here. The Stereo 20 chassis is ground. The signal return is ground. The schematic says it is ground. All of the black ground wires go back to a case screw on one of the big can cap mounting lugs. Everything continuity beeps to the earth pin on the mains plug anyway. Leak grounded the capacitor can, and very deliberately so by the looks of things. I was actually a bit worried by not doing so on my TL12 Plus rebuild, though left the F&T cap plastic skin on as I was mounting it internally and wanted to be sure it couldn’t short anywhere in any scenario even if it became loose (which it won’t!). As ever my aim is only to sympathetically restore. I have no interest in second-guessing or “improving” these classics.
PXL_20220402_152157600~2 by Garf Arf, on Flickr
Looks to be too much paint on the cans.