I have aquired an old Turntable with built in amp. It needs a little bit of servicing but it works. The 2 speaker outputs on the back are homemade by an unknown previous owner. It puts out almost no sound when 2 speakers are hooked up. When one speaker is removed the audio gets much louder but still not very loud. So I opened it up and to my surprise there was a tube amp inside. I am handy with tools and a soldering iron but I know nothing about tube technology. Is this worth fixing ?