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I've been running a CTC-15 clone as a daily driver straight from the line for about 5 years. The first two were in an area where the line voltage ran high probably 120-125, since then it is usually 117 give or take 6 volts. I've never had a problem with the fly going into over-current....Granted I did monitor and dip the cathode current by adjusting the linearity coil (which is probably a better way to control it than a variac).
If you are worried about overheating the fly adjust the lin. coil for min H out Tube cathode current and leave the HV cage door open for ventilation.
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