GREAT catch, finding the RCA manuals. Thanks.
All of my Capeharts have the filter caps isolated from the chassis, at roughly the same -90V. Jordan did something really brilliant with an isolated terminal strip to securely mount his electrolytics. Thread is here:
http://audiokarma.org/forums/showthread.php?t=96894
But I haven't opened up my 721 yet to know how much room there is under there.
Yeah, I didn't really figure I wanted to learn how to do alignment work but that Admiral has made me stretch my brain cells. It's been a tough one.