I ran across a working '72 [Edit: ends up being later than the guy thought], Ampeg V-4B for $500, which I know can be had for some less. It all works but the switches are a little iffy. If not all the way on it can be distorted sounding. The guy had played if for the 6-7 years with no problems. Nothing has been done other than clean the switches. It does not have the Ampeg badge and the cloth is a little discolored. The case is in great shape considered it's age. I know if might need new tubes and possibly a cap job (don't know how you know when that's needed). From what I can tell visually everything looks really clean. Tubes aren't discolored if that would even matter. I'm thinking I could easily drop another $200 in getting it tuned up and given nothing has been done in the last 6-7 years that seems likely. The guy used it regularly and is just downsizing. So my question is, is this worth going for or cold this end up costing a lot more than would be smart? Thanks!