Sony SITs - 2SK82 E Rank With 2SJ28 F Rank

[Nelson Pass]

Our friends at circuitdiy.com are running low on the 2SJ28 E Rank P channel
VFETs (my fault apparently), but they do have a supply of the F Rank
parts, and they sent me some samples to see how well they will work when
paired with the 2SK82 E Rank (which is still in supply).

I put them in the SIT amplifier circuit which was displayed at BAF 2013 and
also another similar amplifier, and apart from a slight difference in the bias
voltage, there was virtually no performance difference.

Actually, the F Rank P channel gave slightly better results, but this is within
experimental error.

So you can safely purchase these parts and put them in push-pull VFET
(SIT) amplifiers.

I am currently preparing the article on two versions of the Common-Source
amplifier shown at BAF and am also working up at least one Common-Drain version.

I hope to have it out in a week or so for you.

😎

 

[Dennis Hui]

Thank you very much Mr. Pass. I think many of us are looking forward
to your article.

Cheers,
Dennis

 

[flg]

 

[WalterW]

Wow, Thank you Mr. Pass !

That means my 5th Pass amp will be build😀
I have 4 pairs of these Sony SITs...🙂

 

[Soundhappy]

With interesting Sony CS XFRMR amplifier topology this article
be come instant hit

😀😀😀😀😀 That is great news 😀😀😀😀😀

Thank You very much Mr Pass
🙂

 

[marconi118]

what about 2sk60 and 2sj18?

 

[Zen Mod]

pretty much same logic

 

[Nelson Pass]

what about 2sk60 and 2sj18?

Do you have a source for them?

😎

 

[dsdjoy]

I am currently preparing the article on two versions of the Common-Source
amplifier shown at BAF and am also working up at least one Common-Drain version.

I hope to have it out in a week or so for you.

😎

Thank you, sounds great !
I wanted to build a smaller version of the Pass Sony VFET Anniversary amp and have also build up a nice stash of 2sj28/2sk82 KE-33 grade recently.

May I please ask for a Common-Drain version with variable, adjustable number of parallel output pairs ?

 

[Zen Mod]

another Wakoo German

are you, in any way , related to our GE Generg ?

 

[dsdjoy]

another Wakoo German

are you, in any way , related to our GE Generg ?

absolutely, good DIY friends.

 

[Zen Mod]

 

[R-K Rønningstad]

Howdy ZM - have you conceived a nice input/driver stage for the SIT followers.

 

[Zen Mod]

nope

look no further then BA3 Bal

Pa will give ya tiny puzzles about biasing , no need for moi to rape peanut brain

however - his Sony amp is Demonstration of Force ( as many other recent pieces are)

for moi - using them as followers = waste of parts - considering that he's able to make the same with plain dirt mosfets

I'm not sure will he admit that , or not

 

[R-K Rønningstad]

The SIT guru and the SIT followers....

 

[Zen Mod]

😉

 

[WalterW]

Do you have a source for them?

😎

This website seems to have them at a reasonably price:
2SJ18 Manu:SONY Encapsulation:TO-3,P-CHANNEL MOS FET FOR HIGH SPEED SWITCHING IC NEW - IC

2SK60 Manu:SONY Encapsulation:TO-3,P-CHANNEL MOS FET FOR HIGH SPEED SWITCHING IC NEW - IC

Walter

 

[R-K Rønningstad]

It says MOSFET. But these devices should be VFETs. Are these really original Sony parts? Anyone bought from this vendor?

 

[Nelson Pass]

If they are real, then I think you can use them, keeping in mind that they
have a lower power and current rating, and about half the transconductance.

It might be that the 2SJ29 and 2SK82 are the same chip but two to a case,
it's hard to tell.

😎

 

[Soundhappy]

It might be that the 2SJ29 and 2SK82 are the same chip but two to a case,
it's hard to tell.

😎

I remember Mr Rothacher made this photo of 2SK82 opened Thanks a lot
and other 2SJ18 is find on web enjoy !
🙂