[drh4683]

Hello+Welcome to the forum,

Is the picture still weaving with no other picture problems, or does it have weaving with purple/green tinting in the picture? Thats a sign of a leaky filter cap, or a bad degaussing thermistor respectively.
Just out of curiosity, what kind of tube tester do you use? Try to stay away from those lower end testers that only test cathode emission. It is very important that the tester be able to test for "grid leakage" or "grid emission" in TV work. both are the same thing. Do you have a schematic of this TV available? Id start checking voltages at the sync/agc tube and see whats up in that area first. I assume the AGC control doesn't help things. Does the set work like this regardless if an antenna or station is tuned in?