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very strange indeed. Correct no cup used on predictas, just the clip. should be fully seated inside the hole of the anode.
the dag should be grounded, try reading the dag to the ground (just touch one lead to the grey dag and one to chassis ground), it will prob be several hundred ohms since its (dag) not a perfect conductor. Wiping off can be problematic, I have seen dag wiped right of, sometimes its dust but you should still see a grey/back coating clearly on the back of the CRT (except around the anode).
I generally don't overly clean things EXCEPT around the anode and around the HV cage.
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