FINAL UPDATE. Seems to be working fine, and I re-attached C2 to the MV pot. I think it has to do with the fact I didn't use shielded wiring for these knobs (I de-soldered the OEM volume mount/wires and wired directly to the board as I needed a longer length to position it in the Gain position). I moved the dressed wires toward the chassis and things seem mostly OK now. Sort of weird. There is a constant hum when I have both the Gain and Master Volume up 3/4 each or so...not sure if there's any real way to get rid of that ambient hum or not. It's not annoying, just that "guitar amp hum." I also think the Gain pot may need to be swapped out. I have noticed that when moving it in a full sweep that there is an area between 3/4th and 7/8ths of full throttle where an ultra high pitch noise shows up, then disappears before and after. Wondering if that's just the pot itself? It's an Alpha pot, so not a high-end CTS or anything. Also wondering if I should buy a 47pF silver mica cap to put on there. You think that might help in any way (have seen others do that)? Overall, VERY HAPPY with the amp. I just can't believe this little thing is pumping out this much volume through a 1x12...IT'S REALLY, REALLY LOUD! WHAT??? I SAID...... Would certainly love to hear it in a 2x12. THANKS AGAIN BATMAN for this thread, and for the replies on my issues. I can't wait to do this again to another EVJ head when I can find one cheap enough, maybe go for a more Marshally sound. I certainly have plenty of spare parts. Heck, I should put together a quick "cheap build kit" for someone else so they don't have to source everything like I did. I know the name-brand kits out there are certainly overpriced!!!!