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I am not familiar with the B&K setting and indicators, but I have had many tubes with a loose plug and the often poorly soldered pin connections cause an open as opposed to a short. Often people will figure this out and wrap tape around the neck and plug while holding it in the "sweet spot" where the heater circuit is no longer open. This usually works for a while, but also usually comes back to haunt someone later on down the road.
I would get a soldering gun and heat each pin one by one and allow solder to draw up into and fill the void inside the pins. I say to use a gun as a gun will provide enough heat to heat the plug pin as well as the wire CRT lead that lies inside enough to get a good electrical connection. Cold solder joints are one of the most common problems there are and they often have a decent mechanical connection or the appearance of being bonded when in fact they are not bonded at all. Sometimes the flux will actually harden and bond two wires together with almost no continuity, or none at all.
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