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Old 15th September 2015, 04:45 PM   #1
thehoj is offline thehoj  Canada
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Default Alternatives to the 2SK2700

I'm interested in putting together a powerdrive circuit for an 845 amp that I've got built. I'd like to replace the fairly tame class A1 capable driver stage that I'm currently using.

I've discovered though, a lack of 2SK2700 mosfets.. I could order on ebay, but I kind of hate ordering stuff from China.

Are there any other compatible mosfets out there that would be suitable for the powerdrive as implemented on this page 845 SE | Tubelab ?

I've been searching online to find equivalent mosfets, and I'm coming up with stuff that is severely lacking in many of the specs I've found for the 2SK2700.

One suggestion was the STP3NK90ZFP.. But it's got a much lower power dissipation rating, and much higher drain-source resistance..
In trying to match up specs on Mouser's website, I've found parts like the Cree C3M0065090D http://mouser.com/ProductDetail/Cree...2bSBZJ8w%3d%3d, but rds-on is higher 90mOhm, power dissipation is lower @ 125W, but continuous drain current is MUCH higher though 36A..

Or the Fairchild FQA11N90_F109 http://mouser.com/ProductDetail/Fair...NyG138FKIdM%3d.. Which looks somewhat similar, although higher rds-on..

What are the important specs with regard to the powerdrive circuit as implemented in the 845SE tubelab page.

Any suggestions?

Last edited by thehoj; 15th September 2015 at 05:10 PM.
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Old 17th September 2015, 08:16 PM   #2
w5jag is online now w5jag  United States
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My TSE has 2SK3563 in it; I don't know if these are still available.

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Old 18th September 2015, 04:35 PM   #3
tomchr is offline tomchr  Canada
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AOT1N60 springs to mind. Digikey P/N: 785-1184-5-ND

And yeah... Don't buy electronic components on eBay. Get them from the distributor.

Tom
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Old 14th March 2016, 11:05 PM   #4
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Hello,
one of my 2SK2700 is gone to the mosfets paradise.
Now I need new mosfets, there are many ideas but the only good report is about the IRF830A. A genuine 2SK3563 or 2SK2700 in impossible to find.
There in any new in this 2016?
My TSE is silent today.
Regards
Guglielmo
Italy
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Old 15th March 2016, 08:02 PM   #5
thehoj is offline thehoj  Canada
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Quote:
Originally Posted by guglielmope View Post
Hello,
one of my 2SK2700 is gone to the mosfets paradise.
Now I need new mosfets, there are many ideas but the only good report is about the IRF830A. A genuine 2SK3563 or 2SK2700 in impossible to find.
There in any new in this 2016?
My TSE is silent today.
Regards
Guglielmo
Italy
I ended up using the 2SK3564 2SK3564(STA4,Q,M) Toshiba Semiconductor and Storage | Discrete Semiconductor Products | DigiKey
It seems to work well.. I also like the fact that this one has an isolated tab, so no need to use mica pad or insulating collar or anything like that.
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Old 18th March 2016, 12:07 AM   #6
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Hello,
Thanks a lot for your help. I've ordered on Digikey. I 'll keep you informed.
Ciao
Guglielmo
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Old 23rd March 2016, 04:46 AM   #7
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On Semi NDF02N60ZH
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Old 23rd March 2016, 07:24 PM   #8
mpri is offline mpri  United States
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According to the datasheet for the NTE2903 it is a direct equivalent to the 2SK3563. Saw some online at Vetco Electronics and Wholesale Electronics for $2.83 each.

Mike
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Old 24th March 2016, 03:16 AM   #9
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I got several On Semiconductor NDF02N60ZH Mosfets. They work in everything I have put them in including the TSE. They obviously didn't find their way into a million selling produce or two, so On Semi has discontinued them. Mouser still has some.
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