I have a guy wanting to trade me for my Budda Superdrive 30 head. He isn't too impressed by the cleans from the videos on youtube, but I know they sound better in person. He wants to know if he can (a.) take out two of the power tubes and run it at 15w instead of 30 because budda amps are so loud and (b.) if he could clean it up even more by taking out the el84s and putting in 6l6s. would that work? The amp does have the auto bias feature so that might help some when it came time to bias 6l6s if it could be done.