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make sure there is negative bias voltage of the proper amount at the Horiz output grid. (like about -50 volts (negative) If the HO tube has no bias (on account of no drive signal) the tube can draw 1.5 amps or so and, because the HO tube draws its supply voltage through the damper, this can overload the damper.
Be careful because you can destroy an HO tube through an overload and the damage may not be apparent by looking at it. Had this happen on a CTC-16...had bad connection for plate voltage to the horiz oscillator. HO tube lost bias and overloaded. Even when I fixed the osc. to get drive back, the HO tube was toast. Put in new HO tube and worked like it should.
Also I have put a fuse in HO tube cathode circuits...3/10ths of an amp. It will blow if there is an overload and save your flyback.
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