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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."
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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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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