2SK389 and MPS 18

Stefanoo · 5th April 2007, 07:08 AM

Hi to everybody.

I'm making the Aleph P1.7 right now but i'm tring to find also the parts for the next steps.
I wanna build the Aleph ONE but here is the issue:

i'm missing the 2SK389BL and i don't know where to find it for a reasonable time.

Is there any suggestion where i can find about 80-100 of it?

I don't know if i'm wrong but Nelson told on one of his thread that 2SK370 would be a good replace.

Since i'm trying ahead of time to find all the parts for the future projects, another part that i'm missing is the MPS 18 (i wanna also build the Aleph X too).

Any good replacement for this part? would it be necessary to find this exact part inn order to correctly build the ALEPH X?

Any good advice are welcome

Best,
Stefano.

EUVL · 5th April 2007, 11:11 AM

2SK389 is obsolete. Replacement dual FET is LSK389 (not pin compatible) from Linear Systems. You can try to ask for samples.

MPSA18 :

http://www.musikding.de/product_info...21&language=en

or just use BC550 as replacement.

Patrick

Stefanoo · 5th April 2007, 01:10 PM

yes...i heard about the lsk but it's too expencive.
The price of this is around $10 per part....waayyy tooo much for a fet.

I woud like to know if there are fet compatible that i can use as a good replacement for this part.

Nelsooonnn pleeeaaseee help!!!

What part could we use?

claudio · 5th April 2007, 01:56 PM

Hello Stefano,
in Italy you can find the 2sk389 here: http://www.lelettronicaasti.it/mag/magazz.htm
I don't know if it is the BL version, call them and ask. It's cheaper than $10.

housing · 5th April 2007, 02:15 PM

Quote:

Originally posted by Stefanoo
I don't know if i'm wrong but Nelson told on one of his thread that 2SK370 would be a good replace.

2SK370 may be even more difficult to find than 2SK389. All I know is that two N-channel JFETs 2SK170BL make a good replacement of 2SK389BL in my projects.

Stefanoo · 5th April 2007, 02:41 PM

The version of the 289 should be necessary "BL" to fit the specification of the project, right?

Hope Nelson will post this thread giving us an advice on an updated component to use for the Aleph One.

MRupp · 5th April 2007, 02:50 PM

The K389 is current source biased, with about 1mA going through each leg. The Idss rating is not so much of an issue.

You can get articles on how JFets work at the Borbely site, and there are some Siliconix application notes that explain, amongst others, biasing schemes for JFets (search the forum). They will answer those questions. Hope this helps.

GRollins · 5th April 2007, 04:34 PM

I am perpetually short on sleep, so I don't always think as clearly as I'd like...
...but...
Where on the Aleph 1 schematic do you see a 2SK389? All the versions I'm aware of used IRF MOSFETs. The Toshiba JFETs are not drop in replacement parts.

Grey

jacco vermeulen · 5th April 2007, 05:35 PM

Grey,

likely that One should read as Ono.

MRupp · 5th April 2007, 07:12 PM

Maybe I am short on sleep and Stefano really means aleph 1.

That does not mean though that you are not confused

5th April 2007, 07:08 AM	#1
Stefanoo diyAudio Member Join Date: Apr 2006 Location: italia - ora USA -WI	2SK389 and MPS 18 Hi to everybody. I'm making the Aleph P1.7 right now but i'm tring to find also the parts for the next steps. I wanna build the Aleph ONE but here is the issue: i'm missing the 2SK389BL and i don't know where to find it for a reasonable time. Is there any suggestion where i can find about 80-100 of it? I don't know if i'm wrong but Nelson told on one of his thread that 2SK370 would be a good replace. Since i'm trying ahead of time to find all the parts for the future projects, another part that i'm missing is the MPS 18 (i wanna also build the Aleph X too). Any good replacement for this part? would it be necessary to find this exact part inn order to correctly build the ALEPH X? Any good advice are welcome Best, Stefano. __________________ Stefano

5th April 2007, 01:10 PM	#3
Stefanoo diyAudio Member Join Date: Apr 2006 Location: italia - ora USA -WI	yes...i heard about the lsk but it's too expencive. The price of this is around $10 per part....waayyy tooo much for a fet. I woud like to know if there are fet compatible that i can use as a good replacement for this part. Nelsooonnn pleeeaaseee help!!! What part could we use? __________________ Stefano

5th April 2007, 01:56 PM	#4
claudio diyAudio Member Join Date: Feb 2002 Location: Italy	Hello Stefano, in Italy you can find the 2sk389 here: http://www.lelettronicaasti.it/mag/magazz.htm I don't know if it is the BL version, call them and ask. It's cheaper than $10. __________________ ______________________________ My Home Page: www.claudionegro.com

5th April 2007, 02:41 PM	#6
Stefanoo diyAudio Member Join Date: Apr 2006 Location: italia - ora USA -WI	The version of the 289 should be necessary "BL" to fit the specification of the project, right? Hope Nelson will post this thread giving us an advice on an updated component to use for the Aleph One. __________________ Stefano

5th April 2007, 02:50 PM	#7
MRupp diyAudio Member Join Date: Dec 2003 Location: Frankfurt area	Version of 389 The K389 is current source biased, with about 1mA going through each leg. The Idss rating is not so much of an issue. You can get articles on how JFets work at the Borbely site, and there are some Siliconix application notes that explain, amongst others, biasing schemes for JFets (search the forum). They will answer those questions. Hope this helps. __________________ Martin Rupp


	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

5th April 2007, 11:11 AM	#2
EUVL diyAudio Member Join Date: Oct 2003	2SK389 is obsolete. Replacement dual FET is LSK389 (not pin compatible) from Linear Systems. You can try to ask for samples. MPSA18 : http://www.musikding.de/product_info...21&language=en or just use BC550 as replacement. Patrick

5th April 2007, 04:34 PM	#8
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	I am perpetually short on sleep, so I don't always think as clearly as I'd like... ...but... Where on the Aleph 1 schematic do you see a 2SK389? All the versions I'm aware of used IRF MOSFETs. The Toshiba JFETs are not drop in replacement parts. Grey

5th April 2007, 05:35 PM	#9
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Grey, likely that One should read as Ono. __________________ Looks like Sponge Bob has killed another thread.

5th April 2007, 07:12 PM	#10
MRupp diyAudio Member Join Date: Dec 2003 Location: Frankfurt area	short on sleep Maybe I am short on sleep and Stefano really means aleph 1. That does not mean though that you are not confused __________________ Martin Rupp

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
2sk389 and 2sj109 -where	sparkle	Parts	8	3rd July 2009 10:03 PM
Wtb: 2sk389-bl	Buhl	Swap Meet	7	7th May 2009 07:36 PM
WTB: 2SK389 and 2sj109	sernikus	Vendor's Bazaar	0	29th March 2007 06:16 PM
2SK389	sunrise	Parts	3	24th September 2005 08:00 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read