Zenith T575W

Hi everybody, I'm new to this forum, this Zenith radio is my third old tube radio in my collection, the previous ones are a Sentinel and a Town Crier, both only needed outside restoration but this Zenith, even though is working, has a strong hum at any sound volume, my best guess is a problem with the electrolytic capacitor in the power supply, but before opening up the guts I wanted to have an expert opinion!
So here it is:
What could be the most probable cause for a constant hum coming from the speaker at any sound volume? The radio is working properly otherwise.

Thanks!

Hi the filter caps,as you said.As they age they tend to dry out.Change them out.Take photos or number the wires befor you remove them.Good luck.Sprman : )

Thanks! I'll go for the caps first, I'll let you know how it goes.

Fredyair