I picked up a little Kay 703. The tubes light up but there's no sound. I have two questions: 1) what's it going to cost to get this amp running? It looks pretty clean, and I can't imagine it's very complicated to diagnose, since it has only three tubes and two controls. What range am I looking at for repairs? 2) How much would it take to make this a safer amp? I mean, installing an isolation transformer and converting to a three-pin plug. I can solder but I'm no amp tech, so I'm looking for informed opinions on what I'm looking at paying to have this work done. Thanks for helping!