Found this guy on Craigslist selling a non-working SVT head. I'm pretty sure I could get the head for $500, but it is damaged. Here is what he has to say about it in the item description: "Was working until I had a new cabinet made for the head and in the transfer, it fails to work. I get a green light for bias 2 but nothing for bias 1. Tolex is great with a little rash hear and there. Overall very nice cosmetic condition. Comes with extra set of tubes. Here's a chance to pick up an awesome bass rig for a low reserve. Sold as is and no returns." And... "I have received many questions as to why it doesn't work. I am selling this combination as a non working unit. I can tell you this, its whole life has been matched up with an 8 by 10 Vader cabinet. I recently took the internal parts out of the old head box and put them in a replacement box (head) I tried it out in the 212e cab and got no green on the bias 1. I simply want to sell this as non working and let it go to someone who can fix it." My question: does anybody know what's going on here? And would it be a huge cost to have it fixed, or would this end up being a good deal? Thanks!