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Old 5th April 2007, 08:08 AM   #1
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Default 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.
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Old 5th April 2007, 12:11 PM   #2
EUVL is offline EUVL  Europe
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2SK389 is obsolete.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
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Old 5th April 2007, 02:10 PM   #3
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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?
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Old 5th April 2007, 02:56 PM   #4
claudio is offline claudio  Italy
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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.
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Old 5th April 2007, 03:15 PM   #5
housing is offline housing  Hong Kong
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Default Re: 2SK389 and MPS 18

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.
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Old 5th April 2007, 03:41 PM   #6
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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.
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Old 5th April 2007, 03:50 PM   #7
MRupp is offline MRupp  Germany
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Default 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.
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Old 5th April 2007, 05:34 PM   #8
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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.

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Old 5th April 2007, 06:35 PM   #9
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Grey,

likely that One should read as Ono.
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Old 5th April 2007, 08:12 PM   #10
MRupp is offline MRupp  Germany
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Default 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
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