I have a Rocktron Vendetta (egnater) all tube combo, but I'm looking for some more low end. It lacks some of that ballsy low end you'd associate with a modded Marshall..... ...I'm wondering if anyone has any idea how to do this? Or how I can go about figuring it out? I'm fairly handy with soldering, and I've done a few amp repairs before. I know how to drain caps, and work safely.....so any help would be appreciated! Thanks!