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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: Re: Stupid question about tube testers posted by Steve O on March 15, 2007 at 16:58:17:
To convert TV-7 meter readings to umhos, multiply the meter reading by:25 if using the B scale
50 if using the C scale
125 if using the D scaleSo a 12AX7 that tests at 40 on the B scale has a Gm of 40 x 25, or 1000 umhos. A 6L6 that tests at 40 on the D scale has a GM of 5000 umho.
When comparing Gm readings on a tester to the specs in a tube manual keep in mind that the specs are listed under a specific set of conditions. The tester usually does not test the tubes under the tube manual conditions, so the readings won't agree. Plus tubes have a wide GM variation from tube to tube of the same type due to production tolerances/variances.
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Follow Ups
- Re: Stupid question about tube testers - Jim McShane 19:12:29 03/15/07 (2)
- Re: Stupid question about tube testers - izquierdaste 20:07:00 03/15/07 (1)
- But it is the best answer you can get - Russ57 16:11:55 03/16/07 (0)
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