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Old 28th August 2009, 01:28 AM   #21
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Originally Posted by Diomedian View Post
Jeez - how many 2sk170s do you need to come up with a matched millennia?
here's a hint -- 2sk170's are graded in 3 bins -- GR, BL and V. It's my guess that the devices are normally distributed around ~6.6 mA Idss and the bottom part of the tail (below idss of nominally 5, but in actuality 6) is cut off. Hard for me to know if the top of the tail are outliers, but I suspect so.

Depending upon the "precision" you need, this should give you a pretty good estimate!

This would be an excellent "guess the number of jellie beans in the glass jar" question. There oughta be a prize!
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Old 28th August 2009, 02:11 AM   #22
moe29 is offline moe29  United States
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I'd like to make that just 'cause it looks cool : )
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Old 28th August 2009, 02:17 AM   #23
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Originally Posted by Diomedian View Post
Jeez - how many 2sk170s do you need to come up with a matched millennia?
About 1000. I only need to match the average of all P and
N channels. I measure the Idss of all the devices in any case.
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Old 28th August 2009, 03:07 AM   #24
49 - for the 19th time!!!
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Originally Posted by maxlorenz View Post
Heat? I heard someone immersed some amp on oil...maybe vaseline, with its many uses , could also work.
Hmmm - cooking oil heated by 1000 (at least) FET's = deep fried [your choice of food]. This is something we know a lot about in da South!!
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Old 28th August 2009, 10:58 AM   #25
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With the number of jfets you consume you should be able to get Toshiba or someone else to make a new batch of complementary 109's or even a power jfet to your specs. Just the members alone on this forum would be quite a large order.
What are the actual dimensions of that pcb?

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Old 28th August 2009, 01:39 PM   #26
Vix is offline Vix  Yugoslavia
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If a picture is worth a thousand words, then an amplifier is worth a thousand J-fets...
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Old 28th August 2009, 01:54 PM   #27
wicked1 is offline wicked1  United States
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Originally Posted by Nelson Pass View Post
Variac and Elena and Jill and I all went to see Thievery Corporation at the Warfield a couple years back.

The performances were awesome but the sound system sucked.

Tosca / Suzuki
After getting into building my hi-fi system, concerts don't cut it anymore!
But yeah, I didn't realize they used all real instruments. I was very impressed when I saw them live! Most bands Ive seen w/ a very large stage show get sloppy, but thievery corp managed to stay right on the entire time.
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Old 28th August 2009, 02:28 PM   #28
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Some jfets are very inexpensive in quantity purchases....... what a cool idea.
I enjoy audio so much that I constructed a web site. I share my ideas at:
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Old 28th August 2009, 07:43 PM   #29
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This will be very intersting to see when the board is populated.
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Old 28th August 2009, 08:25 PM   #30
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If ever something needed surface mounting it is that design. Esp the stuffing stage.

Mental with a capital M

PCB = heatsink?
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