Modding a TAS5613 amp

[ChuckT]

My experience is that cap in key position can make a big difference. One example is the ta2022 5V pin, put a nice ecap directly on those pins and you can hear improvement in the bass and mid compare to just a ceramic. This is because those pin supply to the internal opamp.

I don't know how much affect will the cap change have, but I will at least use the datasheet value.

I did a search on the bootstrap capacitor and its value is very important,
datasheet is 33nf , but 100nf is used. The bootstrap capacitor cannot be too small, but will too big cause a problem?

http://www.irf.com/technical-info/designtp/dt98-2.pdf

[authlxl]

Originally Posted by ChuckT

My experience is that cap in key position can make a big difference. One example is the ta2022 5V pin, put a nice ecap directly on those pins and you can hear improvement in the bass and mid compare to just a ceramic. This is because those pin supply to the internal opamp.

I don't know how much affect will the cap change have, but I will at least use the datasheet value.

I did a search on the bootstrap capacitor and its value is very important,
datasheet is 33nf , but 100nf is used. The bootstrap capacitor cannot be too small, but will too big cause a problem?

http://www.irf.com/technical-info/designtp/dt98-2.pdf

Oh! it write like below pic,only requset mini value.

[ChuckT]

Here is some pic on the coupling cap replacement. The originals were small 10uf ecaps, obviously I had to add some extension to put a larger cap. 1uf mkt1822 are used here.
The smaller ecaps are changed to 100uf Panasonic FM. I am still waiting for my order of the larger value caps to came.
The tas5613 is located beneath the 2 mounting holes in the middle. The 4 thick traces are the speaker output and the 4 thinner traces are for the bootstrap cap solder in the underside. I might replace the 4 bootstrap caps by solder directly between the output and bootstrap trace to get the cap as close to each of the bst as possible.

[Galgo]

Please share your insights and experiences after this upgrade - how did it influence the sound properties?
Gal

[ChuckT]

I think the coupling cap change from ecap to film is a standard tweak whenever you see an ecap in the signal path. Basically you'll get more details and better high and mid. But the improvement is not as much as I expected, but definitely a worthwhile tweak.
A bigger improvement is replacing the pot and the corresponding wire.

[authlxl]

So stronger parts in modification,we have to develop one new type for highest audiophile.pls give us more excellent advice,we will make it better!

[Galgo]

Originally Posted by authlxl

So stronger parts in modification,we have to develop one new type for highest audiophile.pls give us more excellent advice,we will make it better!

Hmmm...very interesting
Please share with us the upgrades/changes you consider
Gal

[ChuckT]

Originally Posted by authlxl

So stronger parts in modification,we have to develop one new type for highest audiophile.pls give us more excellent advice,we will make it better!

Authlxl, I don't know what quality parts you can use with the price you are charging. But I think you can certainly use a thinner chassis and use the saving for better parts. My Poppulse case definitely has less than half the aluminum than the Genius200W case. And the Genius200w is 2/3 empty inside.
I try to replace the RCA with a Cardas, but the back plate is too thick, damn.

Also, did you try out the ths4131 differential opamp?

[authlxl]

Originally Posted by ChuckT

Authlxl, I don't know what quality parts you can use with the price you are charging. But I think you can certainly use a thinner chassis and use the saving for better parts. My Poppulse case definitely has less than half the aluminum than the Genius200W case. And the Genius200w is 2/3 empty inside.
I try to replace the RCA with a Cardas, but the back plate is too thick, damn.

Also, did you try out the ths4131 differential opamp?

Oh!we have not try ths4131,but same like as OPA1632,OPA1632 is the newer op from BB,I think it sound will better.

Freinds on diyaudio had discussed it in one thread.OPA1632 and THS4131

I think we will get more advices for this amp then we will develop new one ,not instead of this type,only new member in our amp family.

[ChuckT]

Originally Posted by authlxl

Oh!we have not try ths4131,but same like as OPA1632,OPA1632 is the newer op from BB,I think it sound will better.

Freinds on diyaudio had discussed it in one thread.OPA1632 and THS4131

I think we will get more advices for this amp then we will develop new one ,not instead of this type,only new member in our amp family.

Newer not always better, I think ths4131 is similar but different to opa1632.
If u have spare opa1632, I would like to try it on my board.