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Electronic tubes on printed circuit board. I have 2 x EL 84 (I think the U.S.A equyvalent is 6BQ5) and 2 x ECC 83 (don't know the U.S.A. equyvalent) on a tube radio and the affected the p.c.b. But it depended on the qualty of the p.c.b. ... some p.c.b.'s lasted long, very long with tubes onto it.
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OLD, but ORIGINAL, not Made in CHINA.
Sailor Moon
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