I have a chance to pick up an early 70s traynor yba 4. This one's a 1x15 all tube combo. I know most people prefer it as a guitar amp but I'm more in the market for tone than volume. what's most interesting to me is that it has an external speaker jack, which i could run to my 8ohm 1x18 cab for some extra sound. I'm going to check it out tomorrow night. I was just wondering what you guys thought about them. Any experience with these?