Well

Well

Posted by Barry (A) on February 1, 2016 at 13:12:47

In Reply to: RE: Try this posted by mondial on January 31, 2016 at 15:05:31:

You can change settings from/to Fixed or Auto Bias in the "System Menu" when you turn on the power while holding the left arrow button and you scroll through to select it. Of course that's not explained in the Operations Manual until page 20 in Section 8.1!

If you're just trying to test tubes to assure they are ok, I'd still use FIXED BIAS for reasons in the link provided by JAZZDude.

More of a problem is that these two tubes can operate over a wide range of plate voltages as Chris said. Scroll through the tube table screen. If you look closely, there are 2 test settings for the 6NIP and 3 for the 6H30. Note that the eP (plate voltage) and iP (plate current) are different for each test setting when you click on them. You can't duplicate the REF 610T circuit conditions without knowing its plate voltages for these 2 tubes. Of course, as noted elsewhere, a simple "Good" "Bad" tester won't either!

Maybe your dealer/tech knows the best settings? If not, I would just run the tests at the lowest plate voltages 6NIP-2 & 6H30-3 to be safe on FIXED BIAS and be done with it. Note that after the test is run, you have to push the down arrow to get the second section of the tube's measurements (RESULTS2). Remember, they are dual triodes.

This process gives an indication if the tubes are ok and how close they match - just look at % of specification for iP and Gm.

If the real experts here have better ideas on this, please chime in.

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Follow Ups Full Thread

Topic - 6NIP & 6H30Interpretation of tube test results. - mondial 21:41:09 01/29/16 (21)

Interpreting Amplitrex AT1000 tube tester results - JazzDude 10:36:52 01/30/16 (2)

RE: Interpreting Amplitrex AT1000 tube tester results - mondial 13:22:31 01/30/16 (1)

RE: Interpreting Amplitrex AT1000 tube tester results - JazzDude 16:15:31 01/30/16 (0)

RE: 6NIP & 6H30Interpretation of tube test results. - Caucasian Blackplate 10:03:00 01/30/16 (13)

RE: 6NIP & 6H30Interpretation of tube test results. - Jim McShane 15:35:24 01/30/16 (8)

RE: 6NIP & 6H30Interpretation of tube test results. - c1ferrari 16:41:40 02/19/16 (0)

RE: 6NIP & 6H30Interpretation of tube test results. - Caucasian Blackplate 19:29:01 01/30/16 (0)

Excellent answer - Barry 16:08:15 01/30/16 (5)

RE: Excellent answer - mondial 17:41:53 01/30/16 (4)

Try this - Barry 09:11:19 01/31/16 (3)

RE: Try this - mondial 15:05:31 01/31/16 (2)

Well - Barry 02/1/1613:12:47 02/1/16 (1)

RE: Well - mondial 14:31:41 02/1/16 (0)

RE: 6NIP & 6H30Interpretation of tube test results. - mondial 13:17:44 01/30/16 (3)

RE: 6NIP & 6H30Interpretation of tube test results. - Dave Pogue 05:50:23 02/1/16 (2)

RE: 6NIP & 6H30Interpretation of tube test results. - mondial 11:44:55 02/1/16 (1)

RE: 6NIP & 6H30Interpretation of tube test results. - Dave Pogue 11:57:23 02/1/16 (0)

RE: 6NIP & 6H30Interpretation of tube test results. - c1ferrari 07:54:04 01/30/16 (0)

RE: 6NIP & 6H30Interpretation of tube test results. - tubular.well 01:02:37 01/30/16 (1)

RE: 6NIP & 6H30Interpretation of tube test results. - mondial 13:34:38 01/30/16 (0)

RE: 6NIP & 6H30Interpretation of tube test results. - mondial 23:56:38 01/29/16 (0)

Follow Ups

Well - Barry 02/1/1613:12:47 02/1/16 (1)

RE: Well - mondial 14:31:41 02/1/16 (0)

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