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you should see B+ at the cap lead with it disconnected, dont try to read it with it attached. as the other poster said check for a drive pulse with a scope a the grid of the HOT or, if you lack a scope, check for a neg voltage, should be around -35v. check the screen voltage. replace the HOT, Damper, HV rectifier with new tubes.
this is where a B&K analyst comes in handy, besides use as a video signal, it has its own built in plate drive (hook up to the plate cap lead), grid drive,(hook up to the grid of the HOT) for trouble shooting. Do you need it, no, but if you have one it comes in handy.
check for an open resistor in the filament lead of the HV rectifier (if it uses one).
You can also use a neon bulb held near the plate lead (the B&K has one mounted on a plastic stick, you dont want to get your hands near the plate cap).
lastly try unhooking the CRT anode, just to be sure is not loading down the HV.
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