Tokin DEFISIT Duo Capacitor Output Stage Amplifier

[khoasonphong]

Here, my inspire in attachment. The gain will be change, needed also an switch buffer/gain stage for input.
About SIT5 topo , I was surprised when see duo cap output , i would keep this lane :> hear it on my SLOB Baffle

 

[Ben Mah]

I was looking at the pictures of the SIT-5 on sixmoons.com and noticed two 1 Ohm resistors next to the output mosfet, and four resistors that were out of focus next to the THF-51S. I made the assumption that the 1 Ohm resistors were series connected to the mosfet output at the mosfet source. I also assumed that the four resistors were connected between the SIT and mosfet sources and that they were 0.2 Ohm each.

I ran an LTSpice simulation with these values and the AC current at the output capacitors, C4 and C7, showed 414mA peak and 102mA peak respectively. Total AC current was 516mA, with 80% through C4 and 20% through C7.

 

[generg]

Hi Ben, have a closer look at the video review of the audiophiliac Steve and you will see the real value of the four 3W near the SIT.....

:--))

and the two 1R seem to be combined more in parallel with the third 5600uF cap to give an RC filter for the OS.

 

[Ben Mah]

So much for my theory. 🙁

 

[stonegreen]

Here are two more pictures from the video mentioned by generg.

 

[Ben Mah]

I have seen them on the video. Unfortunately the green power resistors are not in focus. The blue 2.2k resistors might be for the front end DC voltage - just a guess.

 

[Ylab]

From here I’m reading R20 5% 5W

 

[wwwtttwww]

There are three big capacitors, what is the third one doing?

 

[generg]

Put two 1R in parallel and a 5600uF in your negative rail.......

:--))

 

[juanitox]

for the 2x big output cap is there a better alternative than the CDE 380LX , EPCOS or KEMET etc.. ?

 

[nicoch58]

look like Pa use Rubycon ?

 

[juanitox]

no on the picture it's cornel dubillier 380LX same as power supply , i think Pa use them because he have them and they are small enough to fit in his chassis. 🙂

 

[nicoch58]

not this ones..https://www.diyaudio.com/community/attachments/sixmoons-sit-5-sit-mosfet-source-resistors-png.1455434/

 

[MARCUS SOLOMON]

for the 2x big output cap is there a better alternative than the CDE 380LX , EPCOS or KEMET etc.. ?

I saw Mundorf 6800uF/63V but don't know is it suitable for that position.

https://partsconnexion.com/mundorf-...0uf-63vdc-mlytic-ag-mlgo-series-polar-radial/

 

[juanitox]

https://www.diyaudio.com/community/...it-5-sit-mosfet-source-resistors-png.1455434/

so not the same brand of capacitor for the SIT and the MOSFET , Baaad Pa 🤔

 

[Ben Mah]

You all have better eyes than my eyes. The capacitors look the same to me.

I have general purpose Chemi-Com in my build, bypassed by Epcos-TDK DC filtering PP metallized film. They are not special caps. Could it be better with "audio grade" capacitors? I don't know. I am very happy with the sound of the amplifier as it is. 🤓

 

[generg]

so not the same brand of capacitor for the SIT and the MOSFET , Baaad Pa 🤔

You mean the resistors?
:--))