SIT-3

[indra1]

Hi WBS, that is what I plan to do in the future. I have some quantity of 2SK28s. We can parallel two 2SJ28s.
I am not so knowledged but I think 2SJ28 + IRF240 will do the same work as 2SK82 + IRF9240. If not someone please correct me.

You may also consider the Laterals such as 2SK135 and 2SK1058, different harmonic flavour. As per usual, evaluate both speaker polarities.

 

[Chul]

You may also consider the Laterals such as 2SK135 and 2SK1058, different harmonic flavour. As per usual, evaluate both speaker polarities.

Using the parts (IRF240 9240) from parts drawer seems to be Nelson's DIY philosophy. But I cannot help the curiosity about Lateral FET..

Thank you for the tips, as before.

 

[Nelson Pass]

I realize we are talking VFET and not SIT, but would it be possible to find an N channel Mosfet whose Gate voltage is the mirror image of the 2SJ28 and then reverse the voltage to accomplish a similar result?

Yes, but be prepared for a phase reversal of 2nd harmonic.

 

[generg]

So we could inverse the speaker connections to compensate this?

 

[indra1]

That is the reason I suggested the lower gm laterals.

 

[Nelson Pass]

Since this is a non-inverting follower, you might want to reverse the phase
of the drive voltage and also the output.

 

[Soundhappy]

SIT-3 user manual http://www.firstwatt.com/pdf/prod_sit3_man.pdf

 

[Soundhappy]

SIT-3 it's visible on all FW products chart

 

[generg]

Hi Mr. Pass,

is this correct, 2% distortion for 1W for the SIT-3

Not 0.2%?

 

[Soundhappy]

AP distortion graph from SIT-3 manual

 

[generg]

I know this, therefore I asked....

:--))

 

[Soundhappy]

I know You know it

 

[generg]

So I know, you know too!

Let us hope that Nelson knows it too....!

 

[Nelson Pass]

Hi Mr. Pass,

is this correct, 2% distortion for 1W for the SIT-3

Not 0.2%?

That was a typo. I thought I corrected that a couple days ago, but
maybe not....

OK, fixed.

 

[generg]

F6, SIT-1, SIT-2 still have the Y behind them.

 

[Soundhappy]

SIT-3 play together with " Cube" neodymium wide range drivers ♬♩
Source : 6moons audioreviews: Cube Audio Nenuphar

 

[Chul]

SIT-3 kit by Nelson..

can be something similar to this? It is the DIY Sony VFet kit that I did not assemble yet. I found that they can be used as DEFiSIT with IRF9240 replacing 2SJ28.

I tried this front end to my DEFiSIT output stage, and I like the sound, which is different from Firstwatt SIT-3. Maybe the FET regulation circuit could give some advantage?

The bias circuit for 2SJ28 needs to be converted for IRF9240 that needs negative voltage.

 

[Zen Mod]

all roads are leading to Rome .....

though , I believe next kit will not be called SIT-3 lookalike

 

[Chul]

Yes of course, and I look forward to the kit offering by Nelason. What will it be like?

 

[Zen Mod]

if Pa doesn't chime in with an answer , we'll continue to live in dark and despair