Originally Posted by Rockdog
You should look into a Suck Knob. They're only $20 on ebay. It's basically nothing more than a master volume pot that you plug into the effects loop. You can crank the normal channel and turn the Suck Knob counterclockwise to keep the overall volume at a level that doesn't make your ears bleed, yet still lets the tubes get nice and toasty.
So you are basically putting your preamp into distortion but leaving the power tubes uncranked.
The OP might be liking the whole amp at full tilt. In that case, he needs an attuenater.