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Did you check the B+ to make sure it's within limits. Usually, the regulated B+ is never over 135VDC. Most solid state sets from the '70's on have a fail safe circuit that will either throw off horizontal sync or kill the horizontal oscillator completely in the event of excessive HV, which is usually caused by high B+. In many of these sets, a flyback failure would short the HOT, which would then short the B+ regulator. If the B+ is too high and you keep running the set, you may cause excessive X-radiation, as well as ruin the new flyback, the CRT, or other parts.
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