If the on/off /vc is a mallory easy to fix. Find Mallory KR8M & KR9M
I remember them in early 60's RCA. Others had repair kits but I never did them.
See hear
https://www.ebay.com/p/2216531325
Manuals are like following bread crumbs. PCB's Golden Rods, supplaments
etc. Trouble is they always go MIA. Most shops didnt take the time to
keep there library up to snuff.
BTW nice catch & sweet cabinet !
73 Zeno
LFOD !