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Old 21st February 2012, 04:25 PM   #1
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Default 2SK170BL

How many 2SK170BLs does it take to get four (well 2 x 2 really) matched for Idss ????

So far I've got 21 plus 16 fakes.

6.51
6.70
6.71
7.09
7.43
7.49
7.96
8.01
8.38
8.42
8.61
8.66
8.96
8.97
9.04
9.16
9.41
9.53
9.57
9.78
10.70


At the initial Idss measuring stage NONE of them match for Idss ?????

I've got another 16 coming to replace the fakes.

Last edited by KatieandDad; 21st February 2012 at 04:53 PM.
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Old 21st February 2012, 04:28 PM   #2
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People buy one batch of 100.
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Old 21st February 2012, 04:30 PM   #3
flg is offline flg  United States
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How many did you buy where?
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Last edited by flg; 21st February 2012 at 04:42 PM.
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Old 21st February 2012, 04:31 PM   #4
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or just buy them matced
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Old 21st February 2012, 04:38 PM   #5
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Quote:
Originally Posted by flg View Post
How many did you uy where?
Quote:
Originally Posted by AudioSan View Post
or just buy them matced
Matched or a batch of 100, I bought to spencer (swap meet) Toshiba 2SK170BL for sales
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Old 21st February 2012, 04:39 PM   #6
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Quote:
Originally Posted by flg View Post
How many did you uy where?
They're not easy to get. I bought 20 from Dalbani (including the 16 fakes) and another 16 from an E-Bay source in China.The Chinese source was sound and the components appear genuine.
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Old 21st February 2012, 04:40 PM   #7
gl is offline gl  United States
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It depends on your definition of 'matched'. For me I would consider the 6.7/6.71 and 8.96/8.97 pairs as being matched for any project I've seen on this site. I would be happy to use several other pairs that are within .05V as well.

Full disclosure: I have matched 100+ of the 2SK170's and of the 2SJ74's and have built a number of projects with them. I typically am happy with the results when I use parts matched to within .1 volts.

Graeme
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Old 21st February 2012, 04:48 PM   #8
flg is offline flg  United States
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What he said! They don't have to be exact, just as close as possible.
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Old 21st February 2012, 04:50 PM   #9
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Quote:
Originally Posted by gl View Post
It depends on your definition of 'matched'. For me I would consider the 6.7/6.71 and 8.96/8.97 pairs as being matched for any project I've seen on this site. I would be happy to use several other pairs that are within .05V as well.

Full disclosure: I have matched 100+ of the 2SK170's and of the 2SJ74's and have built a number of projects with them. I typically am happy with the results when I use parts matched to within .1 volts.

Graeme
Idss mA not volts
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Old 21st February 2012, 04:51 PM   #10
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Quote:
Originally Posted by gl View Post
It depends on your definition of 'matched'. For me I would consider the 6.7/6.71 and 8.96/8.97 pairs as being matched for any project I've seen on this site. I would be happy to use several other pairs that are within .05V as well.

Full disclosure: I have matched 100+ of the 2SK170's and of the 2SJ74's and have built a number of projects with them. I typically am happy with the results when I use parts matched to within .1 volts.

Graeme

There was a quote on the B1 builders thread that stated that the match had to be far closer. Hopefully a few guys will comment about how closely they need to be matched.
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