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RE: Anyone using a Hickok 6000A?

Posted by JazzDude (A) on July 17, 2015 at 07:59:08

In Reply to: Anyone using a Hickok 6000A? posted by Byrd69 on July 16, 2015 at 14:18:29:

Howdy Byrd69. Last week I was curious about how Hickok 6000s measure Mutual Conductance due to an ebay sellers use of a 6000. As a result I dug up information about the tester. You are correct that it makes no sense to apply a factor of 0.65 to test results.

Likely the 0.65 number relates to the Mutual Conductance of an average new-never-used tube. (Average is used as new-never-used tubes do not have exact mutual conductance values.) Applying a 0.65 factor to that number indicates a ballpark minimum value of Mutual Conductance for a working tube. GMs below that number indicate a tube probably should be rejected and above that number the tube probably works fine. Note the use of probably which I mentioned as this procedure and the results provide generalized results; nothing is caste in concrete.

Per the 6000 testers, the manual I read indicated the mutual conductance for each tube listed in the 6000's roll chart is the mutual conductance that is normal for an average tube. Thus the value is not specific to how a new-never-used tube might measure. The listed value serves to provide a generalized idea of whether a tube is within GM criteria of a working tube in good condition.

Roger Kennedy describes limitions of using the 6000 for Mutual Conductance testing. See the linked address. Also in Tubesound.com's instructions for calibrating the 6000, the tester's use for Mutual Conductance testing is described.

Hope this helps a little.

• http://alltubetesters.com/articles/tester_guide.htm   (Open in New Window)

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