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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: testing tubes posted by joessportster on March 13, 2016 at 15:56:47:
Generalizing, tube testers either perform transconductance or emission tests.Mu, as in the 1050mu equals new mentioned in your example, is a unit of measurement that pertains to transconductance. Your B&K falls into the emission camp. It applies an emission test that does not indicate nor correspond to transconductance. Thus for your tube tester you will not find mu values that relate to as new, good used condition, or throwaway tubes.
Per using your tester to determine how much use a tube had. Likely you will only be able to make a rough guess. Tube manufacturers did not specify a quantitative emission value for new tubes. In their lab, B&K may have tested a number of tubes of each tube type. Based on their results they might have made guesses on emission values that correspond to new tubes.
If the good range of your tester's meter has a scale of numbers including 100 than those numbers might indicate the percentage of emissions relative to B&K's guess of the emission value a new tube of a particular tube type would measure on their machine. No one can say if that is what B&K did nor know how far from being in the ballpark their emission guesstimates are.
Tubesound has an informative article about your B&K 606. Check it out.
Edits: 03/14/16 03/14/16
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- RE: testing tubes - JazzDude 10:16:17 03/14/16 (0)
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