Manahem,
As it happens I have chosen to leave the existing carbon comp resistors in place, which replacing the failed transistors and diodes. After replacing the failed transistors and diodes the scope seems to be working perfectly (at least with regard to the beam intensity and blanking).
I have replacement NOS carbon comp resistors on order, but I'm not going to use them unless the Z-axis amplifier starts acting up again. I will look into getting new production parts as you suggested, and look for ceramics, as I would like to have something in my stock other than just metal and carbon film resistors.
-- Jeff Dutky