Hey guys, I have been looking for a vintage 60's B series Ampeg for my home studio to match up with a pre-CBS Pbass for some recordings I have been offered a 1967 B18x ( head only) in great shape. Both channels work as does the echo ( reverb?). It still has the 2 prong plug. Any issues with that? I don't have a lot of knowledge on these amps other than I love the sound of them. I know the market price of these has risen a lot on B-15's since I last looked but I can't get a grasp on a fair market price for an 18x? What is a fair price for head only? What would be a good deal price? Here is pic. What questions should I be asking? Thanks for your help.