I recently received this amp as a gift from my great aunt when my uncle passed away. It's got all the original parts (tubes, amp, transformer, speaker) but when I crank the volume and tone I barely get any sound coming out of the amp. I'm going to replace the tubes and see it that fixes the problem, but I have no idea what this amp is worth. If it's more than the tubes that need fixing, is it worth holding on to this amp? or would I be better off buying a something new? PS. I know pretty much nothing about guitars/amps, I just got my first guitar and am learning as we speak.