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Phil, you need to pull the octal base(s) on the HV retifier(s) not the top lead. These testers can tell if the fillament is conected to it's single loose winding. To para phrase the manual on my 944....Disconnect the top leads on the HO tube and HV rect unplug and completely remove the HV rect tube form the set, and disconect all other wires going to the fly.....If the fly tests good you can then plug the HV rect into it's socket, and if the fly then tests bad with the HV rect in place then the fillament on the HV rect is good.
some testers (like mine) are sensitive enough to measure the short that the HV fillament causes on it's winding when connected!
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