Love the little powerhouse F-30. Would like to achieve and earlier break-up with the clean channel however. How can I get this. I assume a different brand of pre-amp tubes, but which ones. I don't want to put myself into a bind by swapping tubes at this point unless I know that I'll be safe, but I thought maybe someone has done this with this amp and gotten good results. Also the reverb on this amp seems rather weak to me, especially on the 2nd channel. The more drive or even volume, the less reverb. Is this normal or should I call Mesa?