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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: lower bias "looks" better >> Re: Tester settings identical for 5751 and 12AX7? posted by ruffscruff on September 9, 2003 at 11:17:25:
The key to your post is that only some of the tubes test low. If others test normally--then I suspect that the set up data is correct--and works--at least for most tubes. OR--this could be another one of those funky tubes like the 6DJ8--where an individual bias setting needs to be determined for each tester. The base grid signal used (2.5 volts RMS) on the common Hickoks like 600A and 533A is pretty high for a tube like the 12AX7. This is something that Alan Douglas covers in his book on tube testers. All testers have their limitations.The best thing to do would be to test those tubes on another tester like a 539, a TT1, or a Triplett that has a lower base grid signal. That way you could get "another opinion".
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Follow Ups
- Re: lower bias "looks" better >> Re: Tester settings identical for 5751 and 12AX7? - Chris Haedt 12:56:15 09/09/03 (0)
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