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Replacement For Toshiba 2SK170/2SJ74
Replacement For Toshiba 2SK170/2SJ74
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Old 17th January 2018, 09:45 AM   #1
2 picoDumbs is offline 2 picoDumbs  Australia
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Default Replacement For Toshiba 2SK170/2SJ74

I've lost count how many times this question keeps getting asked.

PLEASE USE THESE DEVICES

Linear Systems Matched LSJ74/LSK170 JFET pairs (Grade B) – diyAudio Store

J74/J74 Stereo Differential Kit – diyAudio Store

Linear Systems LSK170 Ultra Low Noise Single N-Channel JFET (8 Pieces) – diyAudio Store

Linear Systems LSJ74 Ultra Low Noise Single P-Channel JFET (8 Pieces) – diyAudio Store
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Old 17th January 2018, 09:58 AM   #2
AndrewT is offline AndrewT  Scotland
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Can we make this a sticky where Members are reminded regularly where to buy genuine devices?
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Old 17th January 2018, 10:03 AM   #3
indra1 is offline indra1  Indonesia
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+1

And request to the store for matched pairs of A and C grade as an alternative since the matched pairs of B grade are quite often in short supply.
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Old 17th January 2018, 10:17 AM   #4
jcarr is offline jcarr  United States
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If you visit Akizuki Denshi and search for P-channel junction JFETs, you can find the 2SJ498-C which is being made by Isahaya Denshi. The package is TO-92S (a short TO-92).
A few of these in parallel can be an adequate 2SJ74 substitute.

??????/?e?d?s/Pch????^FET ?H???d?q??? ?d?q???i ?l?b?g???

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Old 17th January 2018, 11:30 AM   #5
Zen Mod is online now Zen Mod  Serbia
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Replacement For Toshiba 2SK170/2SJ74
Proposal to Mods - please make this Stickiest Sticky

Please.....
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Old 17th January 2018, 12:29 PM   #6
6L6 is offline 6L6  United States
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Replacement For Toshiba 2SK170/2SJ74
K170 / J74 Jfet availability is very spotty. Most, if not all, eBay sellers have fakes.

Linear Systems is trying to make the J74s but their yields are very low, hopefully we'll have a new batch soon and re-stock the store. In the short term, however, we are all waiting.

Every time a new supply seems to be available it's either a false alarm or the people selling get cold feet.

There are some devices that are similar, if not a direct drop-in replacement, but are very nice for audio. Nelson has been talking about using those in new projects.
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Old 17th January 2018, 12:39 PM   #7
6L6 is offline 6L6  United States
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Replacement For Toshiba 2SK170/2SJ74
Spencer's Toshiba Jfet are genuine -

FET Audio | Hi-End Audio Projects
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Old 17th January 2018, 12:48 PM   #8
indra1 is offline indra1  Indonesia
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Quote:
Originally Posted by 6L6 View Post
...Linear Systems is trying to make the J74s but their yields are very low, hopefully we'll have a new batch soon and re-stock the store. ...
Understood. Same problem with matched pairs of other grades?
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Old 17th January 2018, 01:12 PM   #9
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by AndrewT View Post
Can we make this a sticky where Members are reminded regularly where to buy genuine devices?
Quote:
Originally Posted by indra1 View Post
+1

And request to the store for matched pairs of A and C grade as an alternative since the matched pairs of B grade are quite often in short supply.
Quote:
Originally Posted by Zen Mod View Post
Proposal to Mods - please make this Stickiest Sticky

Please.....
But not in the PASS section.
Maybe in the Solid State? or if it's possible in Amplifiers?
And maybe a sticky back up in the Design and Build - Parts section.
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Old 17th January 2018, 01:41 PM   #10
6L6 is offline 6L6  United States
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Replacement For Toshiba 2SK170/2SJ74
indra1 - Linear has very low yields of the J74 is all grades. The store only has matches in B as that's the Idss value that are useful in the Pass circuits. Having matches in different grades would not really help the builders all that much.
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