I've got a MESA Studio Pre. I'm using it with a mosfet poweramp (Tube Works MosValve MV-962) and I'm very happy with it but I want to turn to tubes also with the poweramp. I often read good things about Peavey Classic 50/50 EL84-powered poweramp and I've got the opportunity to buy one for quite cheap. I found two different models on the net (they're pictured below): any difference between the two? Just cosmetics? Or what is the more desiderable version? I have the chance to buy the one in the upper photo. Thank you.