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Old 11th December 2007, 04:42 AM   #1
max29 is offline max29  Netherlands
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Default Tubes measured in microhms = mA..?

..Have some red b. 5692 to measure \ test but can measure them in microhms only with a I -77- B
but need to know the value in mA .

Is there a formula for it or a method of correspondance.
Thank s very much

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Old 11th December 2007, 12:40 PM   #2
SY is offline SY  United States
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I'm not sure what an I-77-B is (something like a CRM-114?), but I've measured a bunch of 5692. Just set them up with a two red LED string in the cathode, a CCS in the anode, 6-8mA of current, then check the gain and, if you have a soundcard, the distortion and noise. A schematic for the test jig can be found in an old post of mine, titled something like "SY gets jiggy."
“Instead of Rational Law, objective truths perceptible to any who will undergo the necessary intellectual discipline, Knowledge will degenerate into a riot of subjective visions. . ." - Auden
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Old 11th December 2007, 03:04 PM   #3
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Originally posted by SY
I'm not sure what an I-77-B is (something like a CRM-114?)
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