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As far as the horizontal circuit the tubes are as follows:
6BG6G - horizontal scanning output
12AU7 - horizontal scanning multivibrator
6AL5 - horizontal AFC phase detector
6W4 - horizontal damping
I'm sure you've checked all the tubes and their voltages. The 6BG6 is very important. In some sets I've found that one 6BG6 will work and another one won't work. Same for the 1B3.
Again, don't forget to check the 10K volt capacitor.
I hope this helps.
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