Thanks for the input Steve, you were right! I was sure I'd have the same arcing issues across a 1-meg pot as I did with the 5-meg, but that didn't happen at all. I ordered a 2w 1-meg pot and some 1-meg fixed resistors, to try and get the correct range for this CRT. I spent the last few days playing around with it and ended up with a trio of 1-meg resistors before the pot (on the high potential side), then the pot with the original 8.2-meg on the other end of it going to ground. That got me to the point where I can dial it in exactly, but there's very little range. Not that it matters, so long as it's sharp at some point. Didn't even have to take the metal back off the pot to make it work either, no zapping whatsoever. Result is below, though there's still some issue with the color circuits. I can't get any color on it no matter what I try, so I suspect the reference oscillator is not working or something. I'll dig into it next chance I get, hopefully the next pic I post is in glorious 1954 COLOR!
