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In Reply to: RE: Silver flashing turned black... posted by JKT on September 22, 2015 at 21:39:38:
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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Follow Ups
- Rainbow Flashing - Triode_Kingdom 22:53:57 09/23/15 (3)
- RE: Rainbow Flashing - Jim McShane 05:37:57 09/24/15 (2)
- RE: Rainbow Flashing - Triode_Kingdom 10:27:05 09/26/15 (1)
- RE: Rainbow Flashing - Jim McShane 12:15:55 09/26/15 (0)