I don't think the OP627 will be a good fit for this circuit these Op Amps are high voltage part (+/-18V), and are not RRIO (rail-to-rail input/output) so the headroom will be minimal (+/-1V maximum output...) And there are very expensive!

Power button: Panasonic : #EVQ-P7C01P   Lock button: C&K : #SK-12C0405-SG 1.5 RT   I found them on Digi-Key http://www.digikey.ca/product-detail/en/0/CKN10374CT-ND http://www.digikey.ca/product-detail/en/0/P16765CT-ND

I didn't test the OPA1611,( too much work for changing these OP ) But they seem OK for the application I choose the ADA4897 mainly for their output current drive power; 80mA (vs less than 40mA for the OPA) I have low impedance IEM, so the current drive of the amps is important for me The ADA...

For the LO decoupling Cap, I don't think that the value of the cap will be so important, I change an 68uF Oxicap for an 220uF Poscap without big sonic différences These amplifiers drive an high impedance load, no need for lot of current I think that the main différences will be the ESR and the...

  The dual differential OP amp must be an RRIO (Rail to Rail I/O) low voltage amplifier, the MUSE8820 is a high voltage amplifier (+/-3.5V to +/-16V) And he is not RRIO at all, so I don't think it will work, and if it work, it will be at the limit, not recommended...

No, I change de LO decoupling cap for a POSCAP: 6TPE220MAZB  (220uF, 6.3V) this is more capacity than the original cap (100uF) but all seem OK, power supply didn't crash at all   Not sure of the improvement, maybe better separation, but Its just an impression   I buyed 10 of these caps, so...

I have not try the ADA4841-2, just a recommendation

I am already changed the HO decoupling cap; the 3x47uF oxicaps are gone and I put one 330uF 10V POSCAP (#10TPE330M) This cap fit nicely to the original pads Bass seem tighter, and go definitively lower   For the HO OP amps, I recommend the model I put on my DX50: the ADA4897-1ARZ For the LO...

So guys, a new Capacitor test Update I am curious to try the "famous" Panasonic FC and another new type of cap   In my first capacitor tests (check post #6), I try: - Jovial 220uF 10V (original capacitors) - Nichicon FW 220uF 10V (#UFW1A221MED1TD) - Nichicon F95 'MUSE' 220uF 6.3V...

  Wait before putting Oxicap... I am just finishing some extensive testing with various Caps, and I plan to put a review soon in DX50 MODs forum

Power button: Panasonic : #EVQ-P7C01P   Lock button: C&K : #SK-12C0405-SG 1.5 RT   I found then on Digi-Key http://www.digikey.ca/product-detail/en/0/CKN10374CT-ND http://www.digikey.ca/product-detail/en/0/P16765CT-ND

I  use an IE8 for 1 year with my DX50 (with differents level of mods), IE80 is almost the same They sound good, but bass is...too much, bloated, hiding the details with a custom cable, sound is much better, better mids and treble, but bass is already here, somewhat bloated But the soundstage...

I Just read all this Modded Shagrathborgir story....   When I solder the differential amplifier on my DX50 (the smaller one with lot of solder), i also have a intermittent pop sound I fund the problem: one of the OP AMP pin have a cold solder the pin really seem soldered, but with a 20x...

Congratulation! Shagrathborgir! Hope you will pleased with the result Yes I try some others OP amps, But due to the risk involved in each change, I limit my choice to the best components I already try on my other rigs mods But maybe, there betters amps to try, but not by me...   Still unsure...

47uF 10V : 6 x 3.2mm 100uF 10V : 7.3 x 4.3mm  much much bigger, too long   The HO amp power supply is at 9V

  Yes, i actually try some new mods, as you can see on the picture, the board just above the OP amp is pretty dirty... I am not finished yet, but I think I am near the end I will return on that soon

  As I said in previous post:   Anyway, i have try the ADA4896-2 for the differential amplifier, and I love it! its my actual differential amplifier but, warning,  its a extreme MOD! do not try at home!! (page 5)   You must carefully pry the little pin to extend them as much as possible...

Picture of the MOD; ADA4896-2 MSOP-8 soldered on SOIC-8 pads:     Cute! hein?

  As I said in previous post:   Anyway, i have try the ADA4896-2 for the differential amplifier, and I love it! its my actual differential amplifier but, warning,  its a extreme MOD! do not try at home!! (page 5)   You must carefully pry the little pin to extend them as much as possible...

The LME is specified with 26mA of drive and 600 Ohms of load, so, he can drive high impedance phones The ADA is specified with 80mA of drive and 100 Ohms of load, better suited for low impedance phones   But in practice, i fund the ADA to have much more punch with any phones: HD650 or IE8

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...

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...

The DAC differential amplifier need a dual OP amp; the ADA4897-1 is a single one There is a dual version; the ADA4896-2 , but only in MSOP-8 package, not in SOIC-8 Anyway, i have try the ADA4896-2 for the differential amplifier, and I love it! its my actual differential amplifier but...

After break-in, the ADA4897 just sing! excellent dynamic!

I buy all my caps on Digi-Key: http://www.digikey.ca/product-detail/en/UKA1A221MED1TD/493-4632-1-ND/2787059