I've heard a lot of talk from a lot of musicians who use the BA115 that there is a mod to put a pre amp tube in this combo. Is this possible and does anyone know how to do it? I have been searching all over the internet and nothing concrete has really come up. I love this amp considering I've had it for 7 years with no issues. It needs more power for practices and I figured for all the hype I have heard about this mod, it will certainly do the trick. I'm very mechanical and can probably handle it myself, just don't know where to start. THANKS!