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Justin,
I agree with Old Coot88, if the TV had been working normally after the rebuild before this problem developed, then it most probably is the Horizontal Output tube.
There is a lesser chance that it is the Horiz Osc / Horiz AFC tube.
Another test would be to observe in dim light and see if the Horizontal Output tube's plates are slightly glowing when the tube warms up. If so, it is either a failing tube, or something in the circuit is throwing the voltages off.
In these early sets a misadjusted horizontal setup or failing component can cause the horizontal output tube to pull too much current.
In this case, if replacing the tube does not cure glowing plates, I'd go after the problem with a VOM rather than the 'scope that you mentioned.
If the problem started with the rebuild, in addition to the above, also include the C8 (Sams) cap or C91 (Factory) cap in series with the horizontal side of the yoke. C8 in Sams is shown as either a .5MFD 100V paper(?) or a .5 ohm at 15,750 electrolytic, while C91 in factory is only listed as a .5 ohm @ 15,750 cycles 100 volt electrolytic. This Cap can change the loading on the flyback and possibly cause ringing.
That big boy should be an electrolytic. A paper cap might work OK, but a ceramic probably will not.
And speaking of "cap" or "trap", who is the character that replaced Admiral Ackbar in your avatar?
James
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