I just replaced my tubes in my Hot Rod Deluxe with Sovtek 6l6wgc tubes and biased them at 60. The amp is way quieter now, but essentially easier to control. I've read these tubes are rated at lower watts. I like the sound, but worry it may screw something up in the long run. Is there anything I should be concerned about? I can't find that much info any Google, anybody else tried these tubes in a hot rod? If so what were your results?