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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Can testing new tubes really determine longevity? posted by ElWoodrow on December 11, 2014 at 15:42:17:
...I've found that most power tubes can be checked to get a rough idea of remaining life by testing at reduced filament voltage. A 6.3 V NOS tube will easily meet its gm/emission spec @5V and many do so @4.3V. This is mainly a check of emission and doesn't account for getter life. Also won't provide a hard figure for remaining hours or % of life. A well used tube may surpass min specs by a good margin @6.3V and not meet specs @5V. I've used this method to assess pricey used tubes at hamfests and antique radio meets. Curiously, a lot of current production tubes don't pass the 5V test even when new.
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- Possibly... - Steve O 19:56:51 12/11/14 (0)
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