[babs]

  In chinese forums they used
LMH6642MA;ADA4841-2YRZ

I was tempted to try the LMH6642 for the HO amplifiers, but these amp are very noisy (specifications), and I have some fear of degrading the SNR for my sensitive IEMS
So I choose the ADA4897 (equivalent specs but ultra low noise) and I didn't regret my decision
 
Changing these amps is a pain (you have to remove the PCB), its better to go to the best one at first...
 
The ADA4841 is probably a very good choice for the differential amplifier, but I personally prefer to use a high frequency device right after the DAC, so I use a ADA4896
But the ADA4841 (SOIC-8) will be much easier to solder than the ADA4896 (MSOP-8), so I can recommend it

 

[shagrathborgir]

can you make a short list of everything you have changed so far and maybe write what you gain in sound quality?I think everyone will appreciate this.Thank you

 

[MuZo2]

 
I was tempted to try the LMH6642 for the HO amplifiers, but these amp are very noisy (specifications), and I have some fear of degrading the SNR for my sensitive IEMS
So I choose the ADA4897 (equivalent specs but ultra low noise) and I didn't regret my decision
 
Changing these amps is a pain (you have to remove the PCB), its better to go to the best one at first...
 
The ADA4841 is probably a very good choice for the differential amplifier, but I personally prefer to use a high frequency device right after the DAC, so I use a ADA4896
But the ADA4841 (SOIC-8) will be much easier to solder than the ADA4896 (MSOP-8), so I can recommend it

After removing the AMP is it possible to fit an adapter? SO swapping amps can be easy?

 

[MuZo2]

Something like this

 

[ptjw99]

I don't think that would be possible, the amplifier in your picture is a through hole style while the ones used in the DX50 are surface mount style. Also the chassis has very little size tolerance so even if there was a mount you could use to swap out the amps I don't think you will be able to close the chassis.

 

[CoiL]

But if You have skill and idea, You could do Your own "socket" 

 I have idea but no tools and probably little lack of skill to do it.

 

[MuZo2]

  I don't think that would be possible, the amplifier in your picture is a through hole style while the ones used in the DX50 are surface mount style. Also the chassis has very little size tolerance so even if there was a mount you could use to swap out the amps I don't think you will be able to close the chassis.

Surface mount can also be used.
Check this thread
http://www.head-fi.org/t/490203/ibasso-d10-impression-aka-opamp-rolling-journal
 

 

[MuZo2]

http://www.ebay.com/itm/Adapter-Replace-Surface-Mount-opamp-SOP8-package-by-DIP8-AD8610-/360847518099

 

[MuZo2]

Also the chassis has very little size tolerance so even if there was a mount you could use to swap out the amps I don't think you will be able to close the chassis.

Both side have coupling caps so it might just fit. Not sure though.

 

[CoiL]

Update.
 
Panasonic FC have now been burnin about 24h. I made simple 3x stereo 3.5mm socket + ON-ON tumbler A/B switching to compare with my Aune T1.
For A/B comparing I used exactly same OFC cable from source to switch point. I compared with both - Fidelio X1 and Piston V2.1. 
 
Aune T1 setup: Siemens E88CC grey shield goldpin tube from 60`s + ELNA SilmicII capacitors (only primary power supply caps are Panasonic FR due to tech/spec reasons).
DX50 setup: Sound Unlocked 1.3.3 @ FLAC / irr off / CPU default + Panasonic FC capacitors for HO.
Source files: FLAC 16/44 
 
Test songs:

1. 1. Dead Letter Circus - Here We Divide (5:07)
   2. The Mars Volta - Meccamputechture (11:02)
   3. Crosses - Bitches Brew (3:30)
   4. Dead Letter Circus - One Step (3:28)
   5. The Mars Volta - Cavalettas (9:32)
   6. Omar Rodriguez Lopez - Elderly Pair Beaten With Hammer (2:03)
   7. Tesseract - Of Reality - Calabi-Yau (2:00)
   8. Omar Rodriguez Lopez - Warren Oates (4:55)
   9. ANTEMASQUE - Providence (4:47)
   10. The Mars Volta - Conjugal Burns (6:39)

 
Result: I basically can`t make difference!

And for me this is awesome! You`d have to be total anal-audio freak to make difference. There might be some tiny tiny micro-differences but when I do blind test without knowing in which position switch is - I can`t make difference! 
 
Of course LO is littlebit different story and I haven`t changed caps in there yet.
 
And there`s still debate going on in my head/ears which I like more - Panasonic FC or VishayBC 038 RSU. Latter one seems to have littlebit better mids, which I really like.
 
Only question for me now is - can it get even better with any other capacitors I`m going to test soon? 
Actually it raises another question for me - what IEM(s) should I take a look into to match Fidelio X1 soundstage, separation etc. What would be step-up from Piston 2.1?
Ohhh no... IEM "madness" begins...

 

[DMinor]

Try the capless LO to an amp with DC servo circuit, completely free of DC coupling caps along the pipeline. 

 

[CoiL]

 
Ok, this is final list of caps I`m going to test:
 
* Nichicon FG 100uF 10V (going to change LO caps and maybe test them on HO also)
* Nichicon FW 220uF 10V 
* Nichicon KW 220uF 10V 
* Panasonic FM 220uF 10V
* Panasonic FC 220uF 10V 
* Panasonic FR 220uF 10V
* VISHAY BC 220uF 10V
* Panasonic AM 330uF 10V
* Nichicon FW 100uF 10V
* Nichicon KA 220uF 10V
* Nichicon KA 100uF 6.3V
* Nichicon KA 100uF 16V (size fits)
* Nichicon SW 220uF 6.3V

Got Nichicon KA and FW series today. By initial impressions KA isn`t better than Vishay, FC or FW. Of course no final conclusion yet, they need burn-in. Also KW and FG haven`t arrived yet. I think Panasonic FC and Nichicon FW will be very close contenders. 
 

 
2) Nichicon FW 220uF 10V (#UFW1A221MED1TD)
 PRO: easy sounding, open soundstage, good balance between the bass, mids and treble
 CON: can lack precision and dynamic, some haze over the sound

@babs , what did You mean by "some haze over sound"? I find no "haze" over the sound. Everything sounds clear. Neither do I find FW to lack in dynamics. Open large soundstage, great separation/transparency and good balance between low/mid/high. Maybe it`s due to FW difference (what did You use during testing?) or gear difference.

 

[babs]

  Got Nichicon KA and FW series today. By initial impressions KA isn`t better than Vishay, FC or FW. Of course no final conclusion yet, they need burn-in. Also KW and FG haven`t arrived yet. I think Panasonic FC and Nichicon FW will be very close contenders. 
 
@babs , what did You mean by "some haze over sound"? I find no "haze" over the sound. Everything sounds clear. Neither do I find FW to lack in dynamics. Open large soundstage, great separation/transparency and good balance between low/mid/high. Maybe it`s due to FW difference (what did You use during testing?) or gear difference.

All comparisons are relatives...
I found Nichicon FW to have some haze relative to Nichicon FG and mainly Kemet Oxicaps
But in comparison to the others caps, the FW are very good
I use A Senneiser HD650 for my tests, some people found HD650 to be veiled, but I don't think so...
 
And When I made my tests, the SU 1.3.3 was not there...

 

[CoiL]

Ok, then it makes sense.
I`m actually starting to find littlebit lack in dynamics in FW highs region. With some few records I`ve found highs somewhat too "monotone". But this doesn`t matter atm, just observing while listening, They are very good but too fresh and need more burning. 

 

[sanakimpro]

babs, I need some help and seeing that you are modding the DX50, I think you can aid me.
My Hold button seems to have stopped working and the hold button now just slides up and down frictionlessly. there used to be a white connector there which I believe is now missing. Is there a way to fix this? I emailed Ibasso and they told me no, and I had to send it in for service..>.> 
Any suggestions, please?
Thank you, your advice is much appreciated.