I have a 1964 B112 I picked up in need of repair at a great price. Had a local tube guru go through and get it working sweet but I think it has a guitar speaker in it? What would be a good, economical 12" speaker to pop in? Also, I picked up a Genz Benz 4 10 ported cabinet out of the local newspaper. It is a bit road beat but sounds good. Is this quailty gear?