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You must have pulled a leaky bypass capacitor that was loading down supply to the output tube--probably the screen grid bypass. This certainly is an omen.
You need to check all the components in the network between the oscillator circuit and pin 5 of the output tube. You could have open or shorted capacitors, and/or resistors way off spec. Check the horizontal drive control, as well as the phase and frequency coils as applicable.
Beware that there may be dissimilarities between the posted schematic and what you have in your set.
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