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I'm no expert but don't think there is much you can do about it. here's what shows n the manual for my sencore Cr70 regarding H K shorts
H-K Shorts
This test determines if a leakage path exists between the filament (heater) and the
cathode. A short or leakage between the heater and cathode cannot be removed with
the remove-shorts function of the CR70 or any other CRT restoring system because
the current needed to remove a short of this type would also open the filament,
resulting in a completely dead CRT. An isolation-type CRT booster will isolate these
shorts in circuits using 60 Hz filament power. Isolation transformers are not
available for CRTs powered from the horizontal output transformer (scan-derived
power) because the power signal has an operating frequency of 15 KHz. In such
cases, the CRT will have to be replaced if the H-K short causes unacceptable results.
To test for H-K Shorts:
1. Move the FUNCTION switch to the H-K SHORTS position.
2. Read the results on the GOOD/BAD meter scale.
3. If there is an H-K short, you may continue with the rest of the tests, but they may
not have meaning if the short is responsible for the poor image on the CRT
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