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RE: Maybe that third one is just for show?

But the glow does not have to be visible! If the heater is covered by the plate and or cathode structure then it can seem to be not working even though it is working and the cathode is properly heated. The most common example of a tube that does that is the 12AX7LPS Sovtek. I get inquiries all the time about that tube not glowing - and I always ask if it is hot.

His is hot, so I am virutally certain the tube is fine, but the heater is not visible.


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