Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Swap Meet Sell your stuff here, who knows, some other fanatic might be interested!

FS: 2SK240 BL/2SJ75 BL matched pairs (2SK170 BL/2SJ74 BL matched quads)
FS: 2SK240 BL/2SJ75 BL matched pairs (2SK170 BL/2SJ74 BL matched quads)
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th February 2015, 06:39 AM   #1
arpagon is offline arpagon  Bulgaria
diyAudio Member
 
Join Date: Oct 2011
Default FS: 2SK240 BL/2SJ75 BL matched pairs (2SK170 BL/2SJ74 BL matched quads)

Up for sale is a pairs of low noise, high Yfs 2SK240/2SJ75 JFET transistors. Transistors are New Old Stock and are absolutely genuine. 2SK240/2SJ75 are well known among the audio society but unfortunately are out of production and that's why are very rare nowadays. 2SK240 datasheet, 2SJ75 datasheet.

FS: 2SK240 BL/2SJ75 BL matched pairs (2SK170 BL/2SJ74 BL matched quads)


2SK240 and 2SJ75 are dual JFETs as you can see from the picture

FS: 2SK240 BL/2SJ75 BL matched pairs (2SK170 BL/2SJ74 BL matched quads)


and each of them is formed by two manufacture matched discrete JFETs tied together with aluminium cap. As a matter of fact 2SK240 is a pair of two 2SK170 and 2SJ75 is a pair of two 2SJ74. That's why purchasing a pair of 2SK240/2SJ75 you'll get a quad of 2SK170/2SJ74 which makes them the best choice for various audio circuits based on Erno Borbely's designs.
Here you can see 2SK240/2SJ75 in action:

FS: 2SK240 BL/2SJ75 BL matched pairs (2SK170 BL/2SJ74 BL matched quads)


All transistors have Idss in range 7 - 10 mA and Ugsoff between 0.4 - 0.5 V. The matching between 2SK240 and 2SJ75 devices is done with Locky_z Intelligent Curve Tracer ( Locky_z Curve Tracer). Below are some sample pictures from real measured devices using Locky_z Tracer.

FS: 2SK240 BL/2SJ75 BL matched pairs (2SK170 BL/2SJ74 BL matched quads)


FS: 2SK240 BL/2SJ75 BL matched pairs (2SK170 BL/2SJ74 BL matched quads)


FS: 2SK240 BL/2SJ75 BL matched pairs (2SK170 BL/2SJ74 BL matched quads)


As you can see, the matching between devices is very close.
I declare Idss matching between K240/J75 at range of 2% but usually it is well better.

Note: Due to the long warehouse storage some scratchings of the transistor's bodies are possible.

What the buyer will receive:
1 matched pair (2 pcs.) of 2SK240BL/2SJ75BL dual low noise high Yfs JFETs (matched quad 2SK170BL/2SJ74BL).

The items will be shipped with Registered AirMail, so a tracking number will be sent immediately upon shipment.

The price I'm asking for a 2SK240BL/2SJ75BL matched pair is EUR 30 (PayPal fees included).
The shipping cost for Worldwide AirMail Registered is EUR 3.

I have a limited quantity of matched pairs that's why if you have an interest send me a PM with query about availability.
  Reply With Quote
Old 19th February 2015, 08:41 PM   #2
zeroalbedo is offline zeroalbedo  Hungary
diyAudio Member
 
Join Date: May 2011
Location: Budapest
I sent a PM.
  Reply With Quote
Old 20th February 2015, 06:46 PM   #3
arpagon is offline arpagon  Bulgaria
diyAudio Member
 
Join Date: Oct 2011
The first trannies sent to zeroalbedo.
  Reply With Quote
Old 24th February 2015, 10:34 AM   #4
arpagon is offline arpagon  Bulgaria
diyAudio Member
 
Join Date: Oct 2011
Still have pairs for sale.
  Reply With Quote
Old 1st March 2015, 02:24 PM   #5
arpagon is offline arpagon  Bulgaria
diyAudio Member
 
Join Date: Oct 2011
There are some pairs yet!
  Reply With Quote
Old 2nd March 2015, 03:17 PM   #6
zeroalbedo is offline zeroalbedo  Hungary
diyAudio Member
 
Join Date: May 2011
Location: Budapest
Hi arpagon,
The metal encapsulated trannies just arrived in a small common plastic case. They are looking as a real NOS.
Thank you for your fine attention and special selection!
  Reply With Quote
Old 5th March 2015, 11:54 PM   #7
arpagon is offline arpagon  Bulgaria
diyAudio Member
 
Join Date: Oct 2011
Since I sold some matched pairs of 2SK240BL only to a forum member, there are matched pairs of 2SJ75BL for sale. The price is the same - 30EUR for matched pair of 2SJ75BL.
  Reply With Quote
Old 7th March 2015, 12:46 PM   #8
MASantos is offline MASantos  Portugal
diyAudio Member
 
Join Date: May 2005
Location: Lisbon Portugal
Is there any way to take the 2 transistors out of the metal can and use them separate?
  Reply With Quote
Old 7th March 2015, 02:41 PM   #9
arpagon is offline arpagon  Bulgaria
diyAudio Member
 
Join Date: Oct 2011
Quote:
Originally Posted by MASantos View Post
Is there any way to take the 2 transistors out of the metal can and use them separate?
Yes, it is possible. You have to cut the metal cap with sharp pliers. As a matter of fact, I already did that operation with one cup because of curiosity and due to the fact that transistors inside it was not closely matched.
I can upload pictures if you are interested.

Last edited by arpagon; 7th March 2015 at 02:42 PM. Reason: punctuation
  Reply With Quote
Old 7th March 2015, 04:44 PM   #10
kannan_s is offline kannan_s  United States
diyAudio Member
 
Join Date: Jun 2009
FS: 2SK240 BL/2SJ75 BL matched pairs (2SK170 BL/2SJ74 BL matched quads) Send a message via Yahoo to kannan_s
Do you dot indication for Drain on these ? ( erno ' article shows that dot indicate drain terminal on one)
  Reply With Quote

Reply


FS: 2SK240 BL/2SJ75 BL matched pairs (2SK170 BL/2SJ74 BL matched quads)Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
For trade: Matched 2SK147 BL's for 2sj313 & 2SK2013 Chamberman Swap Meet 3 29th January 2015 11:33 AM
FS Toshiba 2SK170-BL Ruach Swap Meet 0 21st June 2013 07:38 AM
Want To Buy 2SK146-BL 2SJ73-BL 2SK147-GR1 2SJ72-GR1 megasat16 Swap Meet 15 16th September 2010 01:37 AM
Selling JFETs - 2SK170-BL, 2SJ74-V Ruach Swap Meet 113 3rd March 2010 11:28 AM


New To Site? Need Help?

All times are GMT. The time now is 01:33 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki