LinearSystems LSK389 compliment to the Toshiba 2SJ109?

[Mikey70]

Hello dear community,
I own some original Toshiba 2SJ109 because I wanted to build the AlephJ.
Now I'm interested in JeffDeGaar's Up-Amp...
The LSK389 is currently available from LinarSystems, can I use this as a compliment to the 2SJ109 and these differential amplifiers according to Papas Susy?
Thank you for your help!

Best regards
Mike

 

[lauda]

The NAC Group appears to have the LSK389 in TO-71 and SOIC packages in stock. I have ordered other Linear Systems parts from these folks in the past without issue. They are listed as a "worldwide online" distributor on Linear Systems' website, so with luck they will deliver to Germany.

 

[Mikey70]

Hi, the delivery is not a problem, Digikey has it and delivers to Germany without any problems.
I'm interested in whether they work in conjunction with the 2SJ109 in the UGS from Jeff DeGaar'S UP-Amp.
I think yes, they should correspond to the Toshibas.

 

[cubicincher]

The original Toshiba 2SK389BL has a Yfs of circa 20mS,

Toshiba 2SJ109BL has a Yfs of circa 22mS.

Linear Systems LSK389BL has a Yfs of minimum 8mS in the datasheet.

Will it fit as a complementary pair/ quartet? You will have to try.
Cheers
Dirk

 

[Mikey70]

Thanks Kubikchincer,
That's a useful tip, I just looked at it, but both Linear system and Thosiba give a typical value of 20mS, but Linearsystems only guarantees 8mS

 

[gary s]

There is a guy who has the Toshiba 2SK389's in all 3 grades for sale at the moment in the Swap meet.

https://www.diyaudio.com/community/threads/toshiba-sevenfotters.399186/#post-7347605

 

[Mikey70]

@gary s: Thanks!

 

[gary s]

Also GR grade only if needed. An older post though, so not sure if still available from him.

https://www.diyaudio.com/community/threads/fs-toshiba-2sk389-gr-2sa1349-gr-2sc3381-gr.143997/

 

[lauda]

Hi, the delivery is not a problem, Digikey has it and delivers to Germany without any problems.
I'm interested in whether they work in conjunction with the 2SJ109 in the UGS from Jeff DeGaar'S UP-Amp.

Uh, yeah, sorry about that. 😳 I'm so preconditioned to part unavailability that I added an "un" in front of your "available".

 

[Mikey70]

@lauda: No Problem