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FS: NOS Genuine Toshiba JFETs 2SK170BL // 2SJ74BL Matched Pairs
FS: NOS Genuine Toshiba JFETs 2SK170BL // 2SJ74BL Matched Pairs
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Old 13th March 2017, 10:18 PM   #1
Kim Bay Smidt is offline Kim Bay Smidt  Denmark
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Location: Aarhus, Denmark
Default SOLD: NOS Genuine Toshiba JFETs 2SK170BL // 2SJ74BL Matched Pairs

Sets available: none

Up for sale are IDSS matched pairs of genuine Toshiba 2SJ74BL & 2SK170BL that you can use for e.g. the Nelson Pass Sony VFET amplifier or the Nelson Pass B1 rev. 2 buffer linestage.

Each set contains two pairs, totally 4 JFETs.
I’ve only 12 sets on sale. First come, first served.

The sets are matched from a bag (100 pcs) of genuine Toshiba JFETs 2SJ74 BL grade and were bought from BDent back in 2010.
I’ve attached a copy of the invoice for my purchase.
Provided is a sample measurement to prove they are within the specs. Measured using a Peak Electronic Atlas DCA75 Pro.
Diameter: Mystery 'sj74'? jfets

The genuine 2SK170 BL grade were bought from either Newark, Farnell, Mouser or Digikey, I can’t remember.
I’ve no invoice copy for the purchase. The bag contained 200 pieces.
Provided is a sample measurement to prove they are within the specs.

I’ve matched them with a very simple rig as suggested by Nelson Pass on passdiy.com.
First I made a course and fast measurement to put them into groups.
The groups were then measured to obtain a more accurate measurement the given day at the given temperature.
Finally I cherry picked JFETs from the groups and made a final measuring of the pairs. The measurement were made when the current settled on my measuring device (multimeter).

Before you ask: ‘will you curve trace sets for me?’
Sorry, no, too time consuming and not really worth the effort.
If IDSS matching is good enough for Nelson Pass, IDSS matching is good enough for me.

The measurements in the provided table are conservative to avoid having you kicking my a** for not being 110% accurate. And you know that the measurements were made with my measurement gear not calibrated to the tenth digit, measured in my house at a temperature that specific day and so on. So the measurements are relative to each other more than specific accurate current values. Okay?

PRICING world wide shipping & paypal fee included:

Each set (2x J74 + 2x K170) is EUR 42 / 45 USD.

For track and trace information add 11.30 USD.

Payment via PayPal, please pay in USD.

Have a look at the attached PDF file 'J74-K170 matched pairs' and PM me the reference number for the prefered set(s) you are interested in, e.g. ‘SET #1’ and the name of your country.
First come, first served.

I’ll then send you a total for the two shipping options, my PayPal address and mark the set reserved for you if available. Otherwise I'll offer you another available set close to the one you selected.
Attached Images
File Type: png 01 J74 specs.png (138.2 KB, 867 views)
File Type: png 02 J74 data.png (30.0 KB, 864 views)
File Type: png 03 J74.png (33.5 KB, 860 views)
File Type: jpg 04.JPG (133.2 KB, 860 views)
File Type: jpg 05.JPG (126.2 KB, 856 views)
File Type: jpg 06.JPG (158.8 KB, 194 views)
File Type: png 07 2SJ74SALES copy.png (279.6 KB, 192 views)
File Type: jpg 08.jpg (172.1 KB, 195 views)
Attached Files
File Type: pdf J74-K170 matched pairs.pdf (29.7 KB, 99 views)

Last edited by Kim Bay Smidt; 1st November 2017 at 09:33 AM. Reason: Sold the goods
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Old 13th March 2017, 10:19 PM   #2
Kim Bay Smidt is offline Kim Bay Smidt  Denmark
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...and the 2SK170 specs and data.
Attached Images
File Type: png 09 K170 specs.png (119.1 KB, 176 views)
File Type: png 10 K170 data.png (28.4 KB, 81 views)
File Type: png 11 K170.png (32.9 KB, 82 views)
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Old 13th March 2017, 10:33 PM   #3
MASantos is offline MASantos  Portugal
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Do you have any of the unmatched 2sj74 available? I have plenty 170's but could use a few extra j74.
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Old 13th March 2017, 10:38 PM   #4
Kim Bay Smidt is offline Kim Bay Smidt  Denmark
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Sorry no.

Quote:
Originally Posted by MASantos View Post
Do you have any of the unmatched 2sj74 available? I have plenty 170's but could use a few extra j74.
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Old 14th March 2017, 02:35 AM   #5
SyncTronX is online now SyncTronX  United States
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Hi,

Somewhere in there should be the current gain? Or am I thinking BetaDC?

For the Toshiba BL its something like 350 - 800? Yes?

Where do your fets fit into this range?

Cheers
__________________
-- Sync
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Old 14th March 2017, 06:11 AM   #6
Kim Bay Smidt is offline Kim Bay Smidt  Denmark
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These are JFETs not BJTs.

Quote:
Originally Posted by SyncTronX View Post
Hi,

Somewhere in there should be the current gain? Or am I thinking BetaDC?

For the Toshiba BL its something like 350 - 800? Yes?

Where do your fets fit into this range?

Cheers
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Old 7th April 2017, 06:25 PM   #7
Kim Bay Smidt is offline Kim Bay Smidt  Denmark
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bump
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Old 18th April 2017, 03:41 AM   #8
dmon is offline dmon  United States
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Just got mine today. Fine shape. Thanks again!
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Old 18th April 2017, 02:37 PM   #9
Kim Bay Smidt is offline Kim Bay Smidt  Denmark
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Nice to know your precious JFETS arrived safe, thank you.

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Originally Posted by dmon View Post
Just got mine today. Fine shape. Thanks again!
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Old 25th May 2017, 06:58 PM   #10
sagitis is offline sagitis  Australia
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hi do you still have any left ?
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