2SK129 schematic problem

ANALOG GUY · 3rd August 2006, 02:50 AM

I bought 80pcs of 2SK129 (diff jfet) from ebay so long time ago, now I can't find any datasheet or schematic for them.

Where can I find a link for use this device ? , I'll compare both NPD5566, 2SK332, 2SK389, 2SK129 soon !!!

Thanks
analog guy

Leolabs · 3rd August 2006, 02:59 AM

Apa Khabar??Are you sure they are 2SK129????

What I can find is only 2SK109.

rpapps · 3rd August 2006, 03:32 AM

Which, by an odd coincidence, is the number (109) on the drawing.

ostie01 · 3rd August 2006, 04:49 AM

Hi, mouser give NTE 2389 and Fairchild FDP3672 as replacement Not the same package but maybe close spec, Good luck

ANALOG GUY · 3rd August 2006, 04:59 AM

2SK129 it's an n channel diff jfet with interesting package, 50V 10mA 300mW.

I have seen 2SK129 in NAKAMICHI CAR SUB-MONO-AMPLIFIER but I can't find a schematic for this one.

mlloyd1 · 3rd August 2006, 05:25 AM

can you describe the package more?

are these two seperate plastic to-92 package (or maybe a little bit taller than t0-92 package) devices wrapped togther in a piece of tin?
if so they might be same pinout as 2sk146/2sj73.

good luck,
mlloyd1

edit:
actually the answer is in your picture. it's been so long i forgot the japanese symbols for gate, drain and source. just find a japanese version of a known jfet datasheet and match the symbols

Quote:

Originally posted by ANALOG GUY
2SK129 it's an n channel diff jfet with interesting package, 50V 10mA 300mW.

I have seen 2SK129 in NAKAMICHI CAR SUB-MONO-AMPLIFIER but I can't find a schematic for this one.

CBS240 · 4th August 2006, 09:12 PM

we have no members here from Japan?

Jeff Pedelty · 6th October 2006, 05:06 PM

I haven't found any data sheets either, but I'm working on a Sansui G-7500 that needs two 2SK129s. If you need copies of that amp section let me know.

Can you provide a source for 3 or 4 FETs?

Thanks

JP

ANALOG GUY · 7th October 2006, 05:30 AM

Jeff Pedelty :
OK, How many do you want ?

I already tested both 2SK389 & 2SK129, I loved 2SK129 with TR cascode circuit.

I also used it instead of 2SK389BL on PASS ONO, it's very good for MM section

Thanks
analog guy

Jeff Pedelty · 9th October 2006, 12:10 PM

If I could get four, that would be great, in case I toast a couple on my first try.

Are you looking for schematics to use these in?

Thanks,

Jeff

3rd August 2006, 04:59 AM	#5
ANALOG GUY diyAudio Member Join Date: Sep 2005	Yes I'm sure 2SK129 it's an n channel diff jfet with interesting package, 50V 10mA 300mW. I have seen 2SK129 in NAKAMICHI CAR SUB-MONO-AMPLIFIER but I can't find a schematic for this one.

4th August 2006, 09:12 PM	#7
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	we have no members here from Japan? __________________ All the trouble I've ever been in started out as fun......

6th October 2006, 05:06 PM	#8
Jeff Pedelty diyAudio Member Join Date: Oct 2006	2SK129 schematic problem I haven't found any data sheets either, but I'm working on a Sansui G-7500 that needs two 2SK129s. If you need copies of that amp section let me know. Can you provide a source for 3 or 4 FETs? Thanks JP

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3rd August 2006, 02:59 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Apa Khabar??Are you sure they are 2SK129???? What I can find is only 2SK109.

3rd August 2006, 03:32 AM	#3
rpapps diyAudio Member Join Date: Jul 2004 Location: nowhere of interest	Which, by an odd coincidence, is the number (109) on the drawing.

3rd August 2006, 04:49 AM	#4
ostie01 diyAudio Member Join Date: Mar 2005 Location: quebec	Hi, mouser give NTE 2389 and Fairchild FDP3672 as replacement Not the same package but maybe close spec, Good luck

7th October 2006, 05:30 AM	#9
ANALOG GUY diyAudio Member Join Date: Sep 2005	Jeff Pedelty : OK, How many do you want ? I already tested both 2SK389 & 2SK129, I loved 2SK129 with TR cascode circuit. I also used it instead of 2SK389BL on PASS ONO, it's very good for MM section Thanks analog guy

9th October 2006, 12:10 PM	#10
Jeff Pedelty diyAudio Member Join Date: Oct 2006	If I could get four, that would be great, in case I toast a couple on my first try. Are you looking for schematics to use these in? Thanks, Jeff

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