I built this 36w TMB combo a couple years ago from a kit. It works and sounds okay. I’ve identified a few things I’d like to change. 1) it gets really loud after about 1/8th of the range on the volume pot. This applies to both channels. The TMB channel is especially touchy. What can I do about this? I’m pretty sure the volume pot is a A500K. I think I’ll check this first in case it’s B500K by mistake. Q: How can I make the volume pot work across a usable range? I have a Bassman that shows a nice smooth gradual range. 2) I’d like to get more bass out of the amp as a whole. I’m not sure where to start. Q: would C2 and 3 be a good place to start, or C6 and 13? 3) the TMB channel tone stack lacks range. It would more useful if the controls had range. 4) the amp is really loud. Q: is it possible to easily implement a half power switch that took two of the EL84 offline?