Barry,
Look at the crt circuit in the schematic. The diodes can/should be replaced with 1N4937 and I strongly suggest replacing R888 with a Vishay VR37 series 22meg resistor. That carbon will be out of tolerance. I would also suggest replacing the 1mfd condensers for the 70V supplies with a Nichicon ULD type and can be higher in capacitance, e.g. 2.2mfd, and the 1mfd decoupling from the crt bias with a 250V film type. Check the crt bias pot to make sure it is still good. The pot could be open. I have found these and a few others open in the 7000 series then replace them with a 10 turn 3/4W type. Yours does not need to be this type, unless you want it and the pot is bad.
Mark
