Not sure if this is the right place to post this but here I go,

So the issue has to do with Reverb. With my limited knowledge I think it might have to do with the reverb tank, or the tube which controls reverb (I'm not sure if this one is right at all). So if I turn the reverb on, and put the knob anywhere past four, the amp will start humming. The humming starts off quiet, and progressively gets louder and louder, probably within a span of ten seconds to a minute until it's just unbearable. So when this issue came about I decided not to even mess with anything, but I decided to troubleshoot around. So once it started humming, if I turned the reverb knob back down to zero, the hum will continue to go on. If during the humming, I use the provided pedal which turns reverb on/off completely, to turn reverb off, the hum will go away until I hit the button to turn reverb back on. The hum will happen regardless of what volume the amp is at, say it begins humming and I turn the volume/master/drive knobs to zero, it'll keep humming. If I put it in standby and unplug my guitar, then hit standby again, it'll start to hum and progressively get louder and louder. The only temporary solution I noticed, which would only last for a few days or until I move my amp or something is to shimmy the reverb tank away from the speaker, but don't hold me on that one. When I did this a few days ago the hum was completely gone and I was able throw the reverb knob all the way over to twelve without a hum. Also on some occasions if I shook the amp a little, enough to hear the reverb coils/strings or whatever make that weird swishing noise, the hum would go away, but if I were to start playing again the hum would come back and do its thing.

So with all that said, do you have any idea what the issue could be? I'd really prefer to fix it myself if it's simple enough, I just don't want to start poking at stuff I shouldn't be until I know what it is and I should be able to fix it.