ok......I moved the Twin out into the living room so that i could turn it up without destroying my hearing (HA!!!) and sterilizing the neighbor's cat.:laugh2: Mine has the 12AY7 vintage tube setup in the preamp section, but it still has both rectifier tubes in place. I turned it way up and bottom line is that i could probaly sell the Plexi:eek13: This thing gets much nastier than I ever thoght it could. i was riffing on some Judas Priest (Head Out to the Highway) and It sounded VERY right. I was not expecting that. This amp particularly loves both of the Les Pauls. Now It won't do metal, I'm sure, but then again, neither will a plexi without a stomp box of some kinds. I've now concluded that even though he sounded great at the Cream reunion show, Clapton never had those Twins turned up much beyond halfway. I would highly recommend that any of you guys who love the old dirt rock genre go check one of these things out.