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Questions about tubes and gear that glows. FAQ

Rainbow Flashing

That article is NOT correct about rainbow-colored flashing. Several years back, I bought a small lot of NOS 211 tubes. A number of them had flashing that was only about 1/10 to 1/4 the area of normal. The flashing in those tubes was very thin, somewhat see-through, and was rainbow colored starting at the edges and extending into the flashing to various degrees. Every tube with that degraded flashing produced a nasty internal arc when 1KV anode voltage was applied. They were useless in my amplifiers, and I lost a lot of money on the deal. I'm not sure the rainbow symptom affects smaller tubes the same way, but I'll never buy tubes again that look like that.




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