[klondike98]

OK I definitely have some capacitive and resistive leakage. Here's some additional measurements:

[Image: https://www.dropbox.com/scl/fi/wssh2zuhx...07z8&raw=1]
NC=no continuity

(I should have said it earlier but all these measurements are of course with the set unpowered) I can access B- point easily with the set in the ON position because I know which power lead goes to the B- on S-2 ON-OFF switch. The other power plug lead goes to the diode anode. Not sure what I can do about the capacitive leakage but the resistive 4Meg definitely should not be there but hopefully I can track that down. I don't look forward to that on this set! Looking forward to your thoughts, thanks for the help.

I hate to think about it but I could just cut the power cord out, leaving the plug in so it is in battery mode and only use it on battery mode. If I can't get the case isolated that may be my only solution because I'm sure not going to leave it place and have someone get hurt.