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I opened up the RCA WT333B tester and could not find anything obviously wrong. So, I simulated leakage by placing a 270 ohm resistor between the K and G1 terminals on the socket and, as expected, a short was shown on the meter. Then, when I moved the function switch to "remove shorts" and pressed the button, the red lamp that indicates current flow illuminated. I then connected the tester to the tube and I still showed K-G1 leakage that varied between a hard short to midrange to no short at all, and this could be stimulated by tapping on the neck. In "shorts removal" mode, I was unable to clear the short and no light came on. Just for the heck of it, I moved the switch to "clean/balance" and hit the button, which caused the light to blink (telling me that it arced between K and G1. That had no effect on the leakage/short, but the emission and cutoff read very good and the tube passes a life test. It's just a shame that I can't clear that leakage/short between K and G1.
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