2SK97 substitute solution ?

[divu]

Any solution to buy from Linear System, here in Europe ?

 

[Hyperion]

Any solution to buy from Linear System, here in Europe ?

https://shop.micross.com/
https://shop.micross.com/products.aspx?i=12

 

[divu]

Hyperion, thanks for link, but...



Nof found. Make something wrong ?

 

[divu]

Solved.Change in mobile phone the Firefox browser, in computer mode, and i found it. I purchased 6 as a future replacement...Thank's Hyperion.

 

[jidx]

Here where I live I only got this two 2sk30a. Will it be compatible to replace 2sk97? It's for a Sansui Au 717

 

[avionic]

LSK389B is quite difficult to find, outside of linearsystems .

Mouser has them in stock.

https://www.mouser.com/c/?q=LSK389

 

[jidx]

I just finished this PCB; I haven't sent it off for manufacturing yet.

 

[rottalpha]

I just finished this PCB; I haven't sent it off for manufacturing yet.

View attachment 3851811

It works if you do not need two independent jfets
For most vintage amps like the Sony N7, that’s not an option. I suggest you start looking at Linear Systems LSKs.




Here’s an example (gratitudes to @Oilmaster ) except this is further customized to be application specific.


The only challenge going to Linear Systems is cost as quality parts like the LSKs would be multiple times of that of other brands. There are SMD versions of these chips.

Why do you need the replacement for the K97? I rarely see them go bad.

 

[jidx]

The ones in my Sansui AU-717 oxidized, and the pins fell off.

I can't get the outputs down to 0V; if I turn up the volume too high, it shuts down before reaching 70%.

 

[jidx]

It works if you do not need two independent jfets
For most vintage amps like the Sony N7, that’s not an option. I suggest you start looking at Linear Systems LSKs.


View attachment 3851961

Here’s an example (gratitudes to @Oilmaster ) except this is further customized to be application specific.
View attachment 3851964

The only challenge going to Linear Systems is cost as quality parts like the LSKs would be multiple times of that of other brands. There are SMD versions of these chips.

Why do you need the replacement for the K97? I rarely see them go bad.

From what I can see, the 2SK2145 won't work for the Sansui AU-717; I was looking at the 2SK332, but I can't find the version that ends in "F," so I'll have to buy the LSK389B.

 

[rottalpha]

From what I can see, the 2SK2145 won't work for the Sansui AU-717; I was looking at the 2SK332, but I can't find the version that ends in "F," so I'll have to buy the LSK389B.

Well, you do not have to buy too many so it won’t be to bad.
The advantage is that you have two transistors on the same silicone with the LSK part, not two transistors in the same plastic package, as is the case with most other options.