I have made it back to my recent 5E3 build to do a few mods in an attempt to make the amp a bit more modern and versatile. https://www.tdpri.com/threads/ubuyguitars-5e3-project.944300/ I have done the following mods; Larger first filter cap 3-way negative feedback Lead channel Pre-PI master volume Following the directions fro RobRob’s site, the master volume is a 1M pot. I used the Standby switch hole and shielded wire tucked under the lip of the chassis. It is still very quiet. Here’s the wierdness... all the way down, I still get a pretty good signal. Starting to turn the pot up, there’s a very quick volume jump at about 20%, then it doesn’t get much louder after that (it’s loud, full volume). Is this normal for this mod?