[rfeenstra]

A word of advice: do NOT turn it on again. The hum is from components (capacitors) that are bad and need to be replaced. these are life limited components and are way beyond their expected lifespan. You risk burning out difficult to find components if you do not replace all of the capacitors. If you are not capable of doing that yourself, find a qualified person to do it for you. There are people here on this phorum who can help. Nice keepsake from your Grandmother! Take care of it properly.

PS: Welcome!