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Transconductance for kt-90 in plain english
Transconductance for kt-90 in plain english
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Old 7th December 2011, 06:04 PM   #11
kevinkr is offline kevinkr  United States
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Transconductance for kt-90 in plain english
Quote:
Originally Posted by Wavebourn View Post
<snip>

umho is micro mho, mmho is mili mho, mho is backward written Ohm because Ohm is volt/ampere, mho is ampere/volt. I think initially it was a joke.
Not sure what the original provenance of mho was but your explanation makes sense. The unit has been replaced with the Siemen, and that could be a joke too..
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Old 7th December 2011, 06:18 PM   #12
GloBug is offline GloBug  Canada
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Siemen eh?

I know just the girl who can test how much seimen is n your tube.
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Old 7th December 2011, 07:02 PM   #13
MikeR is offline MikeR  United States
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Quote:
Originally Posted by kevinkr View Post
Quite right and I glossed over that unfortunately.. M is 1^6
1^6 is, wait let me get my calculator out, uhh just = 1.
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Old 8th December 2011, 03:06 AM   #14
kevinkr is offline kevinkr  United States
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Transconductance for kt-90 in plain english
Quote:
Originally Posted by MikeR View Post
1^6 is, wait let me get my calculator out, uhh just = 1.
Should be 1e6 or 1 million. I think it was reasonably obvious?
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Old 8th December 2011, 03:38 AM   #15
Wavebourn is offline Wavebourn  United States
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Transconductance for kt-90 in plain english
By the way, try in Perl:

print(int(9.325 * 100 +.5))
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Old 8th December 2011, 03:56 AM   #16
speakerfritz is offline speakerfritz  United States
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this is hilarious. Any other tube, there's a specific number. 8417=25K, KT-88's=11000, el-34=6000, 5881's=5400, etc, etc, etc. But KT-90's is a math formula with conditions and qualifications. So alot of folks say a KT-90 is just a EL-509 with the cap wired to the socket, so that would make a KT-90 have a tranconductance value of 18000.
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Old 8th December 2011, 04:01 AM   #17
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Transconductance for kt-90 in plain english
no , it isn't
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Old 8th December 2011, 04:06 AM   #18
Alfred Centauri is offline Alfred Centauri  United States
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speakerfritz, the g_m of the KT-90, at a particular operating point, exists. If you wish to discover it, make an effort to do so. If not ...

Last edited by Alfred Centauri; 8th December 2011 at 04:13 AM.
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Old 8th December 2011, 04:13 AM   #19
kevinkr is offline kevinkr  United States
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Transconductance for kt-90 in plain english
Quote:
Originally Posted by speakerfritz View Post
this is hilarious. Any other tube, there's a specific number. 8417=25K, KT-88's=11000, el-34=6000, 5881's=5400, etc, etc, etc. But KT-90's is a math formula with conditions and qualifications. So alot of folks say a KT-90 is just a EL-509 with the cap wired to the socket, so that would make a KT-90 have a tranconductance value of 18000.
Yeah all of those numbers are valid for just one specific operating condition if you look at the data sheets. The KT90 is in no way special in this regard.

I also posted the numbers you were looking for in an earlier post.. I used the KT90 in a number of amps and found the typical transconductance in my particular application to be around 9000 - 1000 umhos for the early EI tubes I had on hand.
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