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Well, guys, I'm dragging out the asskicking machine and as soon as I'm done posting this will be strapping myself into it for a bit: problem solved, and YES, it was the noise inverter section. Specifically, the 6AW8 tube was bad. The first section of this tube is the video output and the second is the noise inverter. When I swapped out the tube the vertical locked right in and is absolutely rock solid. I noted that the picture is also with much better contrast and definition.
So I pulled my Hickock tube tester and checked the one I pulled out. Section A was marginally good going into questionable. Section B (the noise inverter) was so far into the bad / replace range it was almost flatline. The gauge needle hardly moved.
But for me the learning experience was the function of the noise inverter, so at least I learned something useful!
-George-
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