I have an opportunity to buy an Ampeg B-25 all tube head from some time in the 1970s, I believe. It's rated at 55 watts, and is about $200. I'm looking for more information on tone, reliability, and how how to use its 2 channels. I was also wondering what the impedance was on the head, and what kind of cab it will take. I have an 8 ohm 4x10 cab, can I use it? Also, is 55 tube watts enough to gig with? Thanks!