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

Michael Black wrote:

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.

I've nbever had 5 leds on 153 DLF, now I have ...

Of course, I do not know anybody close to my location with such a radio (Furnes/Ypres/Dunkeirk/Lille)...

Same for AM radios. It coul be that shortwave is a little bit lees, but it is OK ...

Ali has them: 2sk152:

http://www.aliexpress.com/item/IC-2S...951278662.html



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On Monday, November 24, 2014 1:23:12 PM UTC-8, marc wrote:
Michael Black wrote:

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.

I've nbever had 5 leds on 153 DLF, now I have ...

Of course, I do not know anybody close to my location with such a radio (Furnes/Ypres/Dunkeirk/Lille)...

Same for AM radios. It coul be that shortwave is a little bit lees, but it is OK ...

Ali has them: 2sk152:

http://www.aliexpress.com/item/IC-2S...951278662.html



--

You may wish to order a 2SK152-2 part, specifically -2.
Per: http://www.conradhoffman.com/ICF2010.htm

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What's on Shortwave guide: choose an hour, go!
http://shortwave.tk
700+ Radio Stations on SW http://swstations.tk
300+ languages on SW http://radiolanguages.tk

On Monday, November 24, 2014 1:23:12 PM UTC-8, marc wrote:
Michael Black wrote:

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.

I've nbever had 5 leds on 153 DLF, now I have ...

Of course, I do not know anybody close to my location with such a radio (Furnes/Ypres/Dunkeirk/Lille)...

Same for AM radios. It coul be that shortwave is a little bit lees, but it is OK ...

Ali has them: 2sk152:

http://www.aliexpress.com/item/IC-2S...951278662.html



--
--
What's on Shortwave guide: choose an hour, go!
http://shortwave.tk
700+ Radio Stations on SW http://swstations.tk
300+ languages on SW http://radiolanguages.tk

It ain't cheap, but an exact replacement appears to be available through:
http://www.bdent.com/2sk152-2-sony-transistor.html

On Tuesday, November 25, 2014 6:28:40 PM UTC-5, Ross Archer wrote:
On Monday, November 24, 2014 1:23:12 PM UTC-8, marc wrote:
Michael Black wrote:

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.

I've nbever had 5 leds on 153 DLF, now I have ...

Of course, I do not know anybody close to my location with such a radio (Furnes/Ypres/Dunkeirk/Lille)...

Same for AM radios. It coul be that shortwave is a little bit lees, but it is OK ...

Ali has them: 2sk152:

http://www.aliexpress.com/item/IC-2S...951278662.html



--
--
What's on Shortwave guide: choose an hour, go!
http://shortwave.tk
700+ Radio Stations on SW http://swstations.tk
300+ languages on SW http://radiolanguages.tk

It ain't cheap, but an exact replacement appears to be available through:
http://www.bdent.com/2sk152-2-sony-transistor.html

Ali Baba IS CHEAPEST-a bag of 10 FOR $18.

On Tuesday, November 25, 2014 10:25:03 PM UTC-8, wrote:
On Tuesday, November 25, 2014 6:28:40 PM UTC-5, Ross Archer wrote:
On Monday, November 24, 2014 1:23:12 PM UTC-8, marc wrote:
Michael Black wrote:

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.

I've nbever had 5 leds on 153 DLF, now I have ...

Of course, I do not know anybody close to my location with such a radio (Furnes/Ypres/Dunkeirk/Lille)...

Same for AM radios. It coul be that shortwave is a little bit lees, but it is OK ...

Ali has them: 2sk152:

http://www.aliexpress.com/item/IC-2S...951278662.html



--
--
What's on Shortwave guide: choose an hour, go!
http://shortwave.tk
700+ Radio Stations on SW http://swstations.tk
300+ languages on SW http://radiolanguages.tk

It ain't cheap, but an exact replacement appears to be available through:
http://www.bdent.com/2sk152-2-sony-transistor.html

Ali Baba IS CHEAPEST-a bag of 10 FOR $18.

However, they do not specify which gain batch these come from. The 2010 uses a 2SK152-2.
That's the exact replacement, for gain and performance.

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