[grig]

  Hi Grig, 
 
I'm using right now V5i in LPF and VAS and I have no issues with noise at all; also, no oscillations were found with my scope. Please check my previous posts on this thread for details.
 
Instead, I had this noise you're talking about when V5i were used in Matrix HPA-3B headamp; also, other headfiers had the same issue with V5i when used in different equipment. I believe there's sort of interference or even a small oscillation that may happen under odd circumstances.
 
Cheers, 
Raul.

Hi Raoul,
 
i remember you're-view, and all you're post, because of that i decided to buy this 2, V5i and put them in the lpf section. I believe the're a bit defective, one or both of them. I'm trying to deal with the customer service of the Burson Company to have them replaced, because as is i can't keep them. And you imagine that 1 pin out of 8 it's a bit shorter and the opamp is not stable in the socket, he moves a bit when you push on top, i already sent a couple of videos to the company. They're unlucky this two.
 
Best Regards,
grig

 

[raoultrifan]

1 pin is shorter? Hmmm...that's a bit odd. I remember my V5i opamps were a bit loosy, but I bend them easily and everything went well.
 
What opamps are you using in I/V stage please? I wonder if the combo V5i + I/V opamps may create the noise issue you are talking about.

 

[Nurgayan]

Hi guys,
I want to share my experience on upgrading this device!
 
At one time tried many variants of OPamp.
 
Here are my recommendations:
 
for I/V converter - LME49720HA, NE5534A
 
for LPF section  - one of the best SonicImagery LABS 994Enh-Ticha Dual Discrete, this OPamp operate in Class A.
Slightly simpler, but also performed well OPA1611/12

 

[Nurgayan]

If we talk about a more radical alteration, I recall my modification of Asus Essence One with a replacement Dac chips to Ti PCM1792A. They have full compatibility on the conclusions.Of course, the chip count was changed.
 
As a result of testing, I noticed a small increase in the quality of sound.
 
As a result of testing, I noticed a small increase in the quality of sound. The experience turned out to be quite interesting, but I do not think that it cost all the costs. At least it turned out exclusive. 

 
I wish you all successful experiments!

 

[grig]

  1 pin is shorter? Hmmm...that's a bit odd. I remember my V5i opamps were a bit loosy, but I bend them easily and everything went well.
 
What opamps are you using in I/V stage please? I wonder if the combo V5i + I/V opamps may create the noise issue you are talking about.

if i put the muses or the lme 49990 in the lpf no noise no issues, i have at home two defective lme 49990 that bring noise and channel imbalance in the sound. I have in total 6 lme 49990; two of those are defective and they act weird, but make sense are defective. 

 

[Nurgayan]

  if i put the muses or the lme 49990 in the lpf no noise no issues, i have at home two defective lme 49990 that bring noise and channel imbalance in the sound. I have in total 6 lme 49990; two of those are defective and they act weird, but make sense are defective. 

LME49990 is quite unstable, especially in this device. A characteristic increase in distortion can be observed in the RMAA program. Especially in LPF section, I do not recommend.

 

[grig]

  LME49990 is quite unstable, especially in this device. A characteristic increase in distortion can be observed in the RMAA program. I do not recommend.

i know someone had some issues with, but for me they work flawless just two out of six are defective and that's it

 

[Nurgayan]

  i know someone had some issues with, but for me they work flawless just two out of six are defective and that's it

Clearly, your right!
 
As an analogue of LME49990, I advise you to try out OPA1611. The performance of which in the RMAA is much better.

 

[Nurgayan]

Photos from my archive by modification ASUS Essence One (PCM1792A) 

 
Do not judge strictly...
 

 

[grig]

  Clearly, your right!
 
As an analogue of LME49990, I advise you to try out OPA1611. The performance of which in the RMAA is much better.

thanks for you're advise, any other opamp with great sound that i should try for the stage I/V ?

 

[grig]

  Photos from my archive by modification ASUS Essence One (PCM1792A) 

 
Do not judge strictly...
 

 
i like you're style man, what opamp you we're using in this picture?

 

[Nurgayan]

  thanks for you're advise, any other opamp with great sound that i should try for the stage I/V ?

For I/V stage, I recommend LME49710 and NE5534A

 

[grig]

  For I/V stage, I recommend LME49710 and NE5534A

between the LME 49710 and NE5534A which one is you're favourite ? Did you buy you're opamp on ebay ? In case yes a favourite seller that sell one of this and they're original ?

 

[Nurgayan]

   
i like you're style man, what opamp you we're using in this picture?

This photo was taken while checking the functioning of the device, after replacing the converter chips. ) Therefore, cheap NE5532P.

 

[Nurgayan]

Later, better operational amplifiers were installed.
 
for I/V - LME49990, LPF - OPA1612 and buffer - Discrete OPamp by SonicImagery LABS 994Enh-Ticha