Replacement For Toshiba 2SK170/2SJ74

[Zen Mod]

yes, you can

 

[osscar]

tnx

 

[JeffYoung]

Or trade the lower 4 to someone building a J2. They're perfect for its CCS....

 

[osscar]

good idea, I am a bad seller by nature ..can not trade well ..but if anyone wants them - then I better sell all 8 in the original anti-static packaging...

 

[Zen Mod]

Pa had perfect reason to use (those sissy ones not usually potent enough for gain use) JFets for J2 LTP CCS - he could say that amp is fully JFet, and that is of some meaning thinking of Marketing

Common Greedy Boy can perfectly make that CCS with ring of two bjts, and have even better sleep, knowing that that CCS is better than simple JFet one, while saving precious JFets for something else

I like Papa, but main thing he taught me is to not following blindly

 

[EUVL]

> can perfectly make that CCS with ring of two bjts

A J113, as used by Nelson, with a source resistor is much simpler, and it is still fully JFET.
Also costs nothing.
And according to Walt Jung, better in performance (Fig. 3B, 8B).
https://audioxpress.com/assets/upload/files/Sources_101_P1.pdf


Cheers,
Patrick

 

[Soundhappy]

Enjoy 10PCS JFET Transistor NOS TOSHIBA 2SJ74-GR TO-92 Original | eBay

 

[marconi118]

100% authentic Toshiba?

 

[Soundhappy]

Yes authentic and price is good
GR grade Idss ranging from 2.6-6.5 mA
if you need 2SJ74 BL grade Idss ranging 6~12 mA
then better find another jfet source shop ex: Toshiba 2SJ74 LAB MATCHED QUAD to 0.03mA / 4mV ("B" "BL" 9-10mA Range) | eBay
Can be DiyAudio shop for matched LSJ pairs or quads.
Best regards

 

[marconi118]

Do they have 2sk170 too?

 

[Soundhappy]

Do they have 2sk170 too?

I don't see any 2SK170 but you can send this question to Watanabetomoaki
He get today another jfet 10PCS JFET Transistor TOSHIBA 2SK369-V 2SK369V K369 TO-92 | eBay

 

[Nelson Pass]

I have received some curves of "fake" 2SK170/2SJ74 from Watanabetomoaki
that he measured, comparing them to the real thing.

The interesting thing was that they looked a lot like the J113 and J176
parts...

Of course Watanabetomoaki sells the real thing.

 

[lucpes]

Do these look like originals? I need them for a Parasound A21 that decided to kick the bucket.

 

[JeffYoung]

Are those from punkydawgs? If so, they're the real deal.

 

[Rodeodave]

Looking at the font, you can see the K170 and batch code being in different size, which is good. The 1 is just a line, and the 7 has a curved, uh, stem? Not sure about the nomenclature. Either way, punkydawgs is legit.

 

[Abx74]

I'm not really good in electronic, but does it mean that we can use J113 and a 100R in source resistor instead of K170 in every Pass electronic ? meaning phono (pearl I and 2) and buffer (B1 and Korg)

> can perfectly make that CCS with ring of two bjts

A J113, as used by Nelson, with a source resistor is much simpler, and it is still fully JFET.
Also costs nothing.
And according to Walt Jung, better in performance (Fig. 3B, 8B).
https://audioxpress.com/assets/upload/files/Sources_101_P1.pdf


Cheers,
Patrick

 

[EUVL]

No, but you can use 2x 2SK209GR in parallel to replace 1x 2SK170BL, in pretty much every application.
Just make sure they do not get too hot.


Patrick

 

[Abx74]

Thanks Patrick

 

[adason]

Ideally you should use Linear Systems LSK170, available from diyaudio store (from time to time).

 

[kenev]

No, but you can use 2x 2SK209GR in parallel to replace 1x 2SK170BL, in pretty much every application.
Just make sure they do not get too hot.


Patrick

And what about 2SJ74? Is there a similar replacement?