Specs J-Fet 2SK129A

Nicowico

Active Member
Does anybody knows the specs of this J-Fet, NEC 2SK129A. It's for a driverboard of a BA-F1, which one has messed up
 

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I have bought it as defective. A "technician" messed up both driverboards. Used all different parts but not original and the J fet is missing. A friend of my can fix it, but he need the specs of the J fet.
 
Why specs? Just replace it if it's bad. It is very difficult to find specs on these discontinued parts.
 
Does anybody knows the specs of this J-Fet, NEC 2SK129A. It's for a driverboard of a BA-F1, which one has messed up

Hi,
Email me I'll give free spares (new old stock) by mail.
No spec. can be found for 2sk129a as of now but the equivalent UPA68H has:
http://www.datasheets.org.uk/specsheet.php?part=UPA68H

I have read a previous post by Echowars regarding 2sk129 and it really help solve the problem with my AU-519 (DD/DC circuit) driver board.
Symptom, DC offset keep on rising on L board. Replacing this 2sk129a keeps the value steady at 0 mv.
My first Au-519 (s/n 1229010265) uses 2sk129 can type enclosure, while my other 519 (s/n 219051417) uses IC type UPA68H. With the description on the board it's identical, the specs more or less the same.

Regards
arsenio

I got these 2sk129a from (gave me also some extras): http://www.fibra-brandt.com/
 

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Last edited:
Symptom, DC offset keep on rising on L board. Replacing this 2sk129a keeps the value steady at 0 mv.
Fairly common problem with a bipolar front end, very unusual with a FET pair at the front.
 
Hi,
Email me I'll give free spares (new old stock) by mail.
No spec. can be found for 2sk129a as of now but the equivalent UPA68H has:
http://www.datasheets.org.uk/specsheet.php?part=UPA68H

I have read a previous post by Echowars regarding 2sk129 and it really help solve the problem with my AU-519 (DD/DC circuit) driver board.
Symptom, DC offset keep on rising on L board. Replacing this 2sk129a keeps the value steady at 0 mv.
My first Au-519 (s/n 1229010265) uses 2sk129 can type enclosure, while my other 519 (s/n 219051417) uses IC type UPA68H. With the description on the board it's identical, the specs more or less the same.

Regards
arsenio

I got these 2sk129a from (gave me also some extras): http://www.fibra-brandt.com/

Thank you very much. You have mail.
 
Fairly common problem with a bipolar front end, very unusual with a FET pair at the front.

Really looks unusual and it takes patience to convert (including drilling and rewiring to accomodate) from IC type to can type 2sk129a.
Thanks for all the tips!

Regards!
 

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Really looks unusual and it takes patience to convert (including drilling and rewiring to accomodate) from IC type to can type 2sk129a.
Thanks for all the tips!

Regards!

Sorry for bringing up an old thread but I am in need of this part also. Would you happen to have any spares to sell

Thanks!
Daniel
 
http://www.fibra-brandt.com/

Did you not try the web above, it id still active.
It would be nice to measure this part. One day I guess.
I am not sure if it is a NEC or Toshiba. It is basically a hand selected pair, most probable matched for Idss, which are put into a metal can(Cu) for thermal balance.
So I am guessing a 2sk117(Toshiba) or 2sk163(NEC) pair.
Good luck?
 
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