It's just a rattling 5Y3.

I'm gonna recap and retube this. I am considering just doing 3 separate caps instead of the buying a 20/20/20 can. I need to find a schematic on how to do this though.

ALso, I can get a RCA NOS 5Y3 rectifier from Eurotubes for 30 bucks, but I also ran across this copper 5Y3 . I'm considering going with the copper since it is purported to be easier on the output transformer and I'd like to keep that sucker vintage. Any opinions on this?