Testing KT-90's Ei NIs Yugoslavia - diyAudio
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Old 22nd November 2011, 09:54 PM   #1
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Default Testing KT-90's Ei NIs Yugoslavia

I have 15 Ei NIs Yugoslavia KT-90's I want to test and match up before putting on ebay. Does anyone have GM numbers for KT-90's? Been googling around and can't find anything. I know they are direct replacements for KT=88's and 6550's, but need to make sure about any GM differences.

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Old 22nd November 2011, 10:06 PM   #2
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I have about 10 or 12 of them myself. None are close enough to make a matched pair. They do sound good but nothing like a good pair of KT88's.
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Old 22nd November 2011, 10:06 PM   #3
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Old 22nd November 2011, 10:46 PM   #4
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Thanks for the data sheet. it says 12.7/@250 for triode and 13.4/@250V and 10.1/@400V for pentode. Is that 12700GM, 13400 GM and 10100 GM?
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Old 22nd November 2011, 11:09 PM   #5
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ok, here's what I found out, the kt90 is a modified el509 (cap wired to the socket instead of cap) and the el509 has a gm of 18000. So I'll use that. The ones I tested so far hit that number pretty easy.
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