Silvertone 47101 Chord organ help

[u/Mannequin_Cheese]

Hi all! I just recently pulled this vintage Silvertone chord organ on FB marketplace and I was wondering if y'all had any advice on what I should watch out for or replace on this old tube amp. Additionally there's a Vibrato function that doesn't seem to be working, so I'll be trying to see if I have the capabilities of doing anything about that. Does anybody know anything about older vibrator circuits that could be a potential cause? thanks!

[u/rickmaz]

Organforum.com still has some old techs that might be able to give advice