[istinnstudio]

You can always replace the caps with better quality one and the same Uf.. I believe there is no risk in that if you are ok with soldering. Happy modding

 
the double capacitance could be the one that solves the low end issue. Quality is an other parameter. we will see... keep us updated on your mod... maybe someone with technical skills could answer it for sure, maybe you have discovered a good, safe mod.

  6x330uf (mine) to 6x1000uf is about the triple capacitance, so maybe the psu has to be better than 1A in that case, I do not know, but I use a 3A anyway from an external high quality hard disk drive. And if you say the low end is better, there has to be more power on those capacitors, and because rca is a constant valued amp you are ok. But with dac's internal head-amp there could be issues on high amplification loads... Just a guess

 

[Tzuky]

I see your point.. anyways I am an optimist

 

[istinnstudio]

 

[istinnstudio]

...then I replaced the 470 uf caps with Nichicon KA 1000 uf, the 100 uf Lelon caps with Nichicon KA 100 us, and the fake Elna 10 uf with Nichicon ES Muse bipolar caps.

The specs: 6x1000uf @ 16v; But why have you used polarised for the other 2 capacitors? Is there a reason for this choice? Is the original bipolar?

 

[Tzuky]

All the capacitors are polarized, except the 10 uf. They are Bi-Polar... ordered by mistake to be honest but there is no problem using Bi-Polar capacitor in the place of Polarized one.. in some cases they might perform worse than Polarized but in this case I think it sounds great... Plus that they are Nichicon MUSE series... designed for hi grade audio so no issue there. BTW your dac has 330 UF main caps... the japanese version has 680 uf Rubycon caps... If you are about to change yours I am pretty sure you can go higher than 470 UF with no issues. (it is the same devices manufactured with different components... chinese quality we all know how it is... they use whatever works...lol)

 

[istinnstudio]

A ok, i see. I would like to go as far as you did @ 1000uf, anyway i use it only as dac. So I will try to find some good replacements like you did and avoid the fakes. The nichicon you have chosen is a good choice as far as i can see.

Can you point all the voltages on all those capacitors, so we have a full description?

 

[Tzuky]

1000 ones are 16v, theother ones are 25v. 16v or higher is perfectly fine. Just keep in mind thr size. If you are from europe I recommend tme.eu they are the biggest electrical components supplier for europe so no fakes there.

 

[Tzuky]

TME stands for Transfer Multisort Electronics. They are located in Poland

 

[istinnstudio]

Thanks!

 

[bravomail]

Hi everyone.
I bought cheap 12V 4/5/6A power supply - 7.50 on amazon. I used it to power my FX Audio X6 DAC/Amp. It works perfectly. Now I can power some better headphones like AKG K7XX.
Also better power comes thru line out to power subwoofer and speaker amp.

 

[Eujin]

Hi, 
I do not think that replace 470->1000 will be useful. It's need olny to TPA6120 AMP (VCC+/-) . You can relace it and check it via multimeter (with cap check function) and then replace it back if it normal. 
I dont understand how you put 1000mf , its size 25 mm , but max size 18 mm. 
I just replaced 4.7->10 ,10->22 and 100->100 (all ELNA SILMIC II)
What better OPA2134 or OPA2604 ? Its really good question if you wanna holywar )) One say that 2134 sounds warmer and other 2604 sounds clearly. First you can do - replace 2134 and check sound
Sorry for my english. 

 

[istinnstudio]

  Hi, 
I do not think that replace 470->1000 will be useful. It's need olny to TPA6120 AMP (VCC+/-) . You can relace it and check it via multimeter (with cap check function) and then replace it back if it normal. 
I dont understand how you put 1000mf , its size 25 mm , but max size 18 mm. 
I just replaced 4.7->10 ,10->22 and 100->100 (all ELNA SILMIC II)
What better OPA2134 or OPA2604 ? Its really good question if you wanna holywar )) One say that 2134 sounds warmer and other 2604 sounds clearly. First you can do - replace 2134 and check sound
Sorry for my english. 

 
Thanks for your findings, are you sure those capacitors are involved only on the headphone amplifier stage? This is a very important detail.
I think the capacitors used in the mod above are type "nichicon KA" (audio grade) 16v 1000uf, their dimensions is 10mm x 16mm.
I have also read that the "2134 sounds warmer and other 2604 sounds transparent" and also that the 2604 might have issues with low voltage. But at this level, the final conclusion or choice has to take care the personal musical choices, the other parts/components of the system, the room etc. I would personally keep it and start some small improvements as you did.

 

[istinnstudio]

re-posting this link (japanese version modifications translated):
 
https://translate.google.gr/translate?sl=ja&tl=en&js=y&prev=_t&hl=el&ie=UTF-8&u=http%3A%2F%2Flog-yoshinon.seesaa.net%2Fcategory%2F24520056-1.html&edit-text=

 

[Tzuky]

Interesting.. By the way I got the OPA2134 back in... I thi k thatthe OPA2604 distorts dueto low voltage... As for the 470 vs 1000 I can clearly see tha path after the on/off switch so I am pretty sure that they are used for power supply probably both the headphone amp and the line level RCA... This is just guessing. Eujin thank you for the input! In the future I might try one more op amp... The LM4562.. Itis really cheap so no harm to try..

 

[istinnstudio]

... Op Amps: Myths & Facts
 
http://nwavguy.blogspot.gr/2011/08/op-amps-myths-facts.html