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Before tearing into the HOT, I am still curious about the Horiz Output tube current. You say that with the screen grd feed resistor shorted, is the cathode voltage, hence current correct? With the screen resistor shorted, was the screen voltage correct? (eg high enough?)
Could be the HOT has a shorted winding. But then again there may be a problem in the boost circuit.
What makes me think it may not be the HOT is that the horizontal output tubes are running cool.
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