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I would not every use a tube tester on:
Damper/horz out/HV rec/shunt or regulator tube.
If you are having any HV issues it best to try subbing known working tubes in those areas. I don't think most tube testers can simulate the working environment of a tube, esp those.
I pretty much only rely on the shorts test before installing any new tube just to make sure it does not damage the set being worked on.
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