Yesterday my buddy finally sold me his Sunn 200S. It's just the chassis (hand written date of January, 1968) but has new tubes. Produces some sound but there's definitely a crappy solder connection which could be part or all of the problem.
There's a guy on eBay selling new replacement parts for Sunns, like handles, cab corners, etc. so I may hit him up for other stuff.
Anyone have a cabinet for one lying around? Hahaha!