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Old November 26th 14, 09:10 PM posted to rec.radio.shortwave
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Default Sony 2001D 2SK152 replacement ....

On Wednesday, November 26, 2014 11:05:36 AM UTC-5, Mark Zenier wrote:
In article ,
RF Collins wrote:
RF Collins wrote in news:g9CdnaJ8rIcM5u_JnZ2dnUU7-
:

marc wrote in :
Hello,
I fit a 3 pin plug and tried some transistors ..
I get a good result with a C369 ...
Any comments?

I did not find my stock replacements, but have a box of spare parts
from ?? all kind of old electronics ... ;-)
Marc

You need an N channel JFET. Only replacement I have seen is an NTE312.
Radio Shack used to stock them in the stores, now only online.

Jim


Here is a tutorial on the junction field effect transistor or JFET:

http://www.electronics-tutorials.ws/...or/tran_5.html



I've got the 2SK152 datasheet on my ftp directory on ftp://ftp.eskimo.com
in the user directory for "mzenier", "Sony2SK152.pdf" . (They moved stuff
around on my ISP, so I don't remember the full URL).

It was designed for the head preamp for VCRs, so maybe the OP can
arm wrestle somebody for an old Beta VCR and find one in there.
Extreme anti-static precautions apply.

There was an small outfit that used semi foundrys to produce a variety of
small signal FETs and other strange stuff (at a price). I think that
they had the 2SK152. "Interfet"?


Mark Zenier
Googleproofaddress(account:mzenier provider:eskimo domain:com)


NTE312 is listed as a replacement. $1.45 from MCM.

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Old November 26th 14, 09:47 PM posted to rec.radio.shortwave
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Default Sony 2001D 2SK152 replacement ....

Google 2SK152 and you will find many sources for original Sony JFETS


Hello,

I fit a 3 pin plug and tried some transistors ..

I get a good result with a C369 ...

Any comments?

I did not find my stock replacements, but have a box of spare parts from ?? all kind of old electronics ... ;-)


Marc



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Old November 27th 14, 10:10 AM posted to rec.radio.shortwave
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Default Sony 2001D 2SK152 replacement ....

Mark Zenier wrote:

I've got the 2SK152 datasheet on my ftp directory on ftp://ftp.eskimo.com
in the user directory for "mzenier", "Sony2SK152.pdf" . (They moved stuff
around on my ISP, so I don't remember the full URL).


under /home/mzenier

Thanks!


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Old November 27th 14, 04:19 PM posted to rec.radio.shortwave
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Default Sony 2001D 2SK152 replacement ....

Since no one else has mentioned it, ISTR that people have used 2N3819 and MPF102 to replace the front end JFET. When I Googled MPF102, one link came up for 10 for $4.80 on eBay. It seems to me that any small-signal n-channel jfet will work well enough to get you a functioning radio (but I have never actually made this repair). While you are at it, you might also want to put parallel back-to-back Si switching diodes (1N914 or 1N4148) between the gate and ground to protect the jfet from ESD.

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Old November 29th 14, 12:30 AM posted to rec.radio.shortwave
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Default Sony 2001D 2SK152 replacement ....

On 11/23/2014 02:23 PM, marc wrote:
Any comparable polarity low noise fet you can squeeze in should be a
vast improvement.
Hello,

I fit a 3 pin plug and tried some transistors ..

I get a good result with a C369 ...

Any comments?

I did not find my stock replacements, but have a box of spare parts from ?? all kind of old electronics ... ;-)


Marc



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Old November 29th 14, 12:35 AM posted to rec.radio.shortwave
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Default Sony 2001D 2SK152 replacement .... 2sk170

2sk170?

On 11/24/2014 12:20 PM, Michael Black wrote:
On Sun, 23 Nov 2014, marc wrote:


Hello,

I fit a 3 pin plug and tried some transistors ..

I get a good result with a C369 ...

Any comments?

I did not find my stock replacements, but have a box of spare parts
from ?? all kind of old electronics ... ;-)


If the replacement isn't a jfet, it won't work at all. That "C369"
sounds more like a bipolar transistor, and if you get "good results",
it's only because the transitor is letting the signal pass through. It
can't amplify, bipolar transistors need forward biasing, and that's not
there since the transistor is supposed to be a jfet.

If you do a search, the need to replace that front end jfet (I'm
assuning that's where the part is) is fairly common, so there are
various people on the web writing about replacing it. I think they've
often used an available jfet, which won't be optimum, but will work
better than a bipolar transistor.

Michael




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