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here is what I would do:
pull the horz out and the vert out tubes (I assume its not a string filament set).
use the variac you have and start out low like about 30vac for 10-20 min
feel the can caps for heat (should be none). If you can find the B+ and hook up a meter to it to make sure the power supply is working (will be low with the low 30vac).
if all good (b+ there and no heat from cans) then go to about 60vac, again leave it be and monitor the B+ and heat.
if everything is looking good, leave it there for an hour, this will help the filter reform if needed.
the current will be well within the range of the variac (no sweep tubes and low B+). after all the above replace the sweep tubes do put a meter in the horz out tube cathode lead (should be about 200ma max) and go for a full power no variac startup. watch for the current on that horz tube to not go to high. If you are not sure about how to do that, just put the tubes back in and watch the horz out for any red plating, while waiting to hear the crackle of the HV.
if it runs just let it go for a min or two. then turn off and check the heat from the tire of the flyback, but really you should go the cathode current check.
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