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Old 21st February 2012, 05:14 PM   #11
gl is offline gl  United States
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Hi Merlin,

Thank you for the correction. It should be milliamps. I think I was thinking in terms of Vgs matching for mosfets -an elder moment I think.


Matching requirements vary depending on the circuit. You asked a general question and I gave a general answer. It would help if you gave more detail on your specific application.

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Old 21st February 2012, 05:17 PM   #12
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These are for a Pass DCB1 BLUE build. The Hypnotise.
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Old 21st February 2012, 05:18 PM   #13
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You want 10 % or better . You have enough 1 or 2 % matches to be just fine
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Old 21st February 2012, 05:23 PM   #14
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Thank you for that. I'll carry on building using the closest matches that I have.
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Old 21st February 2012, 06:26 PM   #15
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I agree, a 0.5 ma match should be close enough.
"Condemnation without Examination is Prejudice"
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Old 21st February 2012, 06:53 PM   #16
Geofd is offline Geofd  United Kingdom
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For a reference
I only matched Idss voltage , and was as follows
7.94, 7.95, 7.97, 7.97 (supply was 9.616 volts)

output offsets of the Mezmerize buffer are -0.4mVdc and -1.6mVdc (Pretty good in my opinion)

PS I also bough 100 from Mouser last year (2SK170BLF) at the end of october last year, maybe they still have stock, only cost 55 USD

With this hundred I got quite a few pairs , and the best quad was 9.55, 9.55,9.56,9.56 (i did not use this as I recall that a lower Idss was better for performacne)

Hope this helps (or gives confidence that super macthing is not so critical)
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Old 21st February 2012, 07:54 PM   #17
flg is offline flg  United States
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Hi John! Nice to see you mingleing over here
"It was the perfect high end audio product: Exotic, inefficient, expensive, unavailable, and toxic." N.P.
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Old 3rd March 2015, 07:10 AM   #18
Rewind is offline Rewind  Sweden
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Does the 2SK170BLF need to be matched for the non-turbo f5? They measure around 9.56.
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Old 3rd March 2015, 02:35 PM   #19
Zen Mod is offline Zen Mod  Serbia
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SK need to be so-so matched with SJ by Idss , for all iterations of F5
my Papa is smarter than your Nelson !
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Old 3rd March 2015, 02:38 PM   #20
AndrewT is offline AndrewT  Scotland
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There is only one sk170 bl in an F5.
It cannot require matching.
regards Andrew T.
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