I have a Bassman RI and looking from the back and going left to right I have: 12AT7, 12AU7, 12AY7. Sounds great to me and it can still crank all the volume I need. Dave Watson Alexandria, Va **************Start the year off right. Easy ways to stay in shape. http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489