I have the opportunity to buy an Ampeg B-15T fliptop amp at a very good price. I have not seen it yet but am going to meet the seller in a couple hours. I found a bit of info on it but not much. It has the upgraded EV speaker in it too. The seller thinks it is from the mid to late 70's Anyone have any thoughts on or experience with this amp? The seller only wants $150 for it. Assuming it is in as good condition as it looked in the photos I think that is a steal.