CTC-15 restoration

[6GH8cowboy]

Took Miniman82's advice and measured the pots.
Even though they have an affect on the screen without showing a dead spot I find the Linearity pot is open near one end!
Now whats the real value? Sams shows 100k which originally I felt was curious being one end is at 400 volts and the other end at almost 1200 volts, a lot of drop for a 1/2 watt pot. The RCA diagram shows 3.5 meg sourcing from B+Boost only. I measure aprox 5 meg before the hidden break. I also believe the replacement will need to have an insulated shaft/ rotor to prevent arc potential.

Who hazards an educated guess as to the value and where to get one. The closest I have is 3.5meg full metal jacket.

By the way I have a couple handfulls of 500k with a switch if anyone needs some. Nylon shaft.