Shui Yuan Audio TPA3255 Modification Thread

daniboun · 2021-03-09 9:15 pm

Hi amigos,

I gave a test with the HanZao TPA3255 + OPA1692, I think it is the very first time they have been tested here with the TPA325X chip.

AMAZING OP AMPS !!!!!! Wouaaaaaaaaaaaa
An incredible definition! the highs are so good! The voices stand out wonderfully on the front of the stage, it's clean and what a soundstage! Love it )

Here are some videos, they are worth what they are worth but it gives an idea from a distance)

Video 1

HanZao TPA3255 OPA1692

Video 2

HanZao TPA3255 OPA1692 B

hansueli · 2021-03-11 5:42 pm

Hello guys

Since today I also have the Shui Yuan TPA3255 amplifier.

Work good. But when unpluged the power supply it shuts down immediately. 3e audio work a few time longer after unplug power supply.

Could it be because the caps are fake?

Will power my both canton subwoofer with it.

daniboun · 2021-03-11 8:49 pm

I don't exactly know what you mean by "shut down immediately"... but mine is working fine )
Ain't sure is related to the caps.... What PSU inside ?

SinGun · 2021-03-12 5:27 pm

joezpapa said:
I have experimented a lot with the TPA3116 amplifier in the past. I came to the conclusion that a capacitance multiplier and a regulated power supply are beneficial. The lower voltage always resulted in a smoother sound. The situation is similar with the TPA3255 amplifier. We tested with a friend for hours yesterday and I can tell you this is one of the best sounding amplifiers I have ever had. (Various Pass Class A, Hiraga Le Monstre, JLH, Penasa Myref rev C, Tripaths, TPA3116 (8), etc.) Plays with extraordinary dynamics, musicality, liveliness. The stage is huge, with excellent separation and details. The capacitance multiplier is very sensitive to the capacitor. I use paralell 2x100uF Panasonic FCs. The supply voltage after the smps is now 29v and the sound with this solution is the most favorable for me. I think this amp is a good starting point for most diyers.

Very interesting post indeed!
I'll second all you are saying. But I did not test a cap multiplier till now. I'm experimenting with different PSUs and found out that a SMPS sounds faster and tighter than a normal unreg PSU. With unreg PSU Steinway did sound more like a Bösendorfer - not very convincing. I will try cap multiplier soon. Thanks for your sharing.

P.S.: My tip use Nichicon KZ, FG, VZ or ELNA Starget, Silmic II caps instead of Pana FC/FR.

SinGun · 2021-03-13 3:05 am

joezpapa said:
Hi Zek, I hope you understand the wiring diagram. It’s a very simple multiplier, but for me it gives the best sound.

Could I use the IRF540 or IRF640?

joezpapa · 2021-03-13 11:22 am

Hi SinGun, I only tried with TO247 mosfets (IRFP140, 150, 240). I recommend this simple multiplier up to 300-400mA. At higher currents, a Juma or Pass multiplier can be used with safety. In this case, mine works perfectly. I tried with 100uF Elna Starget and I really like it. Thanks for the suggestion.

rootmax · 2021-03-13 12:52 pm

daniboun said:
Hi amigos,

I gave a test with the HanZao TPA3255 + OPA1692, I think it is the very first time they have been tested here with the TPA325X chip.

AMAZING OP AMPS !!!!!! Wouaaaaaaaaaaaa
An incredible definition! the highs are so good! The voices stand out wonderfully on the front of the stage, it's clean and what a soundstage! Love it )

Here are some videos, they are worth what they are worth but it gives an idea from a distance)

Video 1

HanZao TPA3255 OPA1692

Video 2

HanZao TPA3255 OPA1692 B

Hi daniboun!! I am interested in buying two OPA1692, where did you buy them?

I am afraid to buy them in China because they are usually fake

Thank you

denbret · 2021-03-13 1:47 pm

Hi Daniboun,

if we compare the OPA1656 vs OPA1692, what do you think the different are?

Denis

daniboun · 2021-03-13 2:08 pm

They are pretty close in the sound "signature" but the high ends are smoother with the 1692 with the HanZao TPA3255 and low ends a bit more "pronounced".
I did the same test with my Purifi modules, but it is difficult to see the difference between both OP Amps....

daniboun · 2021-03-13 2:13 pm

rootmax said:
Hi daniboun!! I am interested in buying two OPA1692, where did you buy them?

I am afraid to buy them in China because they are usually fake

Thank you

All my OP amps come from Mouser with SOIC8 > DIP8 adapter. This is the only way to get genuine ones.

Actually > I can sell any OP amps in DIP8 socket but I need to think about a group buy to amortize delivery costs...

rootmax · 2021-03-13 2:27 pm

OK thanks!! So I have to buy SOIC8-DIP8 adapter and solder over the chip ...

SinGun · 2021-03-13 6:55 pm

joezpapa said:
Hi SinGun, I only tried with TO247 mosfets (IRFP140, 150, 240). I recommend this simple multiplier up to 300-400mA. At higher currents, a Juma or Pass multiplier can be used with safety. In this case, mine works perfectly. I tried with 100uF Elna Starget and I really like it. Thanks for the suggestion.

Hey Joe, thank you and nice to hear that you could enhance the SQ with Stargates. I will implement the CM for my opamp preamp first, after that I will build a CM for my TPA3255. Could you suggest a CM schematic for at least 4A?

SinGun · 2021-03-13 6:57 pm

daniboun said:
All my OP amps come from Mouser with SOIC8 > DIP8 adapter. This is the only way to get genuine ones.

Yep, Mouser is the best suggestion.

joezpapa · 2021-03-14 5:13 pm

SinGun said:
Hey Joe, thank you and nice to hear that you could enhance the SQ with Stargates. I will implement the CM for my opamp preamp first, after that I will build a CM for my TPA3255. Could you suggest a CM schematic for at least 4A?

For high current amplifiers the multiplier doesn’t give me a better sound. Works well in preamp, DAC, D-Class. Juma’s schematic also works at higher currents, but needs to be cooled. I’m not sure at 4 amps, I’ve never tried. In the TPA multiplier, I doubled the Starget capacitor (now 2x100uF), the sound became more dynamic, the bass was better.

vilding · 2021-03-17 4:26 pm

Still waiting for boards, but with the input caps, is there any value in replacing them, or bypassing to get better tolerances? Someone seemed concerned with them being fake too?

rootmax · 2021-03-17 4:33 pm

Hi!
I received the card two days ago and I am listening to it instead of my modded TA2024 which was for me a reference ...
the capacitors mounted are from the Nichicon FW series, they look original honestly, I am considering to change them with the KZ which is Nichicon's top MUSE series, but honestly I have to say it already sounds great that way !! I also thought about changing the two NE5532s mounted, but in fact it sounds really good ... I tried some OPA627s that I already had at home, but I didn't like them, I put back the 5532s ... excellent amplifier!

vilding · 2021-03-17 4:50 pm

Nice! Glad you're enjoying it!

I'll try it with some different opamps I think, just for the fun of it.
Just curious as to the reasoning behind changing caps in a design like this, and what changes to expect.

rootmax · 2021-03-17 4:56 pm

Yes, I'm curious too ... let me know if you make the change what do you think! ;-)

Mello4 · 2021-03-17 5:25 pm

joezpapa said:
For high current amplifiers the multiplier doesn’t give me a better sound. Works well in preamp, DAC, D-Class. Juma’s schematic also works at higher currents, but needs to be cooled. I’m not sure at 4 amps, I’ve never tried. In the TPA multiplier, I doubled the Starget capacitor (now 2x100uF), the sound became more dynamic, the bass was better.

This capacitor multiplier will not help much with the power supply transient load response to a sudden need in high current for the load (high crest factor audio signal), it mainly just filters low frequency ripple.

rootmax · 2021-03-17 5:36 pm

I am feeding it with 4x10.000 uF in parallel ... it should be a good electron reservoir!

Shui Yuan Audio TPA3255 Modification Thread

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