[LaughMoreDaily]

Anyone know the perfect opamp(s) for the JAZZ R7.0/R7.8 Amps?

 

[Setmagic]

@LaughMoreDaily Burson V5i if will fit

 

[LaughMoreDaily]

@LaughMoreDaily Burson V5i if will fit

I think it might... I have a large opamp in there right now and it touches the top of the case when closed.

Is Burson the only one you like in this amp?

 

[Setmagic]

@LaughMoreDaily all OpAmp have some flavores and quality.
Rich sound: OP2228
Warm: Muses series especially 02/8820 (best is 03 but it's expensive and mono so need 2 of them with some mods with JAZZ)
Well balanced LM49720
Bass heavy: LT1364
Best overall: Burson V5i
Best possible: Burson V6 Classic
Last one need some heavy mods for implementation

 

[povidlo]

Please check out my review of Walnut F2.

Includes notes on stock OPA2604, NE5532, V5i, and V6 Classic opamps.

https://www.head-fi.org/showcase/walnut-f2.24964/reviews

 

[bust3r]

Hey all, maybe I can get some opinions? I have a EVGA Nu Audio PC sound card if anyone is familiar with it. Presently it has the stock ADI OP275 (headphone) and ADI AD8056 (Line out) OP AMPS and I'm going to be switching them out for two OPA1612 OP AMPS, for headphone and line out.

Good idea or no?

I'm under the impression I replace the headphone and line out with the same model OP AMP. I really can't find much about the AD8056, but a ton about the OPA1612's. I've heard it's a very good amp and bought them based on the mainly positive reviews. Thanks!

 

[FritzS]

@DJ LP

I have a burson V5i and V6 Classic, and tested with 2228, 1612, 8820, 1361, 1364, 8620, 275 and 49720.
For price/performance 2228 is best opamp and you can buy. You can use a little better 228 as 2x single configuration for xd05+
V5i will be notable superior. Quite similar in sound signature to 2228 but definitely higher level. You can go for V5i dual for better fit.
V6 Classic (don't heard vivid) is only a little better than V5i. 40% more power consumption and can't fit without heavy modifications, no protection from RFI as V5i.
V6 is made for hi-grade desktop audio equipment as upgrade stock IC and there can really do the job.

In older HA project (made early 2009) I used some OPAs such as LM6171, AD843, OPA602, AD847, LT1056, LT1022, TLE2071, OPA604, LME49710, OPA627, Supreme Sound Opamp V5S, AD797, OPA134.
Last time I tested AD797 and OPA134, surprisingly, these sound very good, a touch more appealing than all the others before.
Some German manufacturers of headphone amplifiers use OPA134/OPA2134, Jan Meier sometimes AD797, Funk probably LME49710 series or its dual types.

Supreme Sound Opamp V5S I also like very much but not optimal.

As attachment the unmodified schematics of amplifier and rail splitter. I have improved some things there.

The project thread: https://www.head-fi.org/threads/new-wna-mkll-head-amp-kit.99596/

 

[Magic77]

Just a quick question for the opamp rollers. Could a Bipolar chip be used in a circuit that originally uses a JFET chip? Thanks

 

[FritzS]

@Magic77
There is no clear 'yes' and no 'no' to this.
It depends entirely on the circuit design all around and on the respective OPA.
In my circuit, the NFB resistors have low impedance, so I can easily switch between BJT and FET types.
In my circuit, you should only use OPA types that run without problems from a gain factor of 1.

 

[Magic77]

@Magic77
There is no clear 'yes' and no 'no' to this.
It depends entirely on the circuit design all around and on the respective OPA.
In my circuit, the NFB resistors have low impedance, so I can easily switch between BJT and FET types.
In my circuit, you should only use OPA types that run without problems from a gain factor of 1.

Thank You for your response. I figured also that it’s important to know the type of circuit first. I know plenty of people just do swap outs and are not really sure if they are truly correct. Just curious if you have tried any of the discrete opamps that are available such as the ones from Burson Audio.

@Magic77
There is no clear 'yes' and no 'no' to this.
It depends entirely on the circuit design all around and on the respective OPA.
In my circuit, the NFB resistors have low impedance, so I can easily switch between BJT and FET types.
In my circuit, you should only use OPA types that run without problems from a gain factor of 1.

 

[povidlo]

Made a simple, non-technical review of Little Bear portable tube amp using Burson Audio Supreme Sound V6 Vivid opamps.

Chech it out: https://www.head-fi.org/showcase/little-bear-b4-x.25234/reviews

 

[Setmagic]

I have question about OPA1622 implementation.
In official Texas Instruments evaluation board they suggest 10uF in rail capacitors

I have spare 47, 100 and 220uF good electrolytic capacitors.
In many DIY applications I see 100 or 220uF capacitors in such headphone output.
I figured out my device have originally 10uF MLCC as well probably due to space and price performance.
Do You think putting additional 100 or 220 uF can improve sound quality?

 

[raoultrifan]

It's all about lowering the ripple without inducing pre/post ringing on the V+/V- rails. Use a scope and record power ON and power OFF then see if there's any ringing. Also, check if the ripple & noise across V+/V- is below 1 mV RMS. If so, then forget about adding more (or bigger) caps.

Worrh mentioning that sound quality is measurable, so give it a try. Although given today opamps' PSRR, PSU's ripple will not affect opamp's outter THD+N, unless PSU is defective or not properly choose for this application.

 

[Setmagic]

Thank You @raoultrifan, it's time to go for scope.

 

[redrol]

That is why I am asking. In my country, a few years ago I was able to buy the LME49720NA and the LME49720HA from local online shops. Now I can only find the LME49720NA but for SMD mounting.
I wanted to open the ACMEE MF-01 to change the "Muses02" for the Burson V5i, but it doesn't fit. I've tried it with several sockets to see how it works. I also tried the LME49720NA and LM4562.
This DAP comes standard with the Muses02, I don't know if it's original. But I felt that its sound was a bit dark and soft. After switching to the LME49720NA its sound became more analytical and clear, as I like it. But I found the LM4562 a bit softer, even though many people here say they are the same... I found the V5i somewhat brilliant, but I didn't stay with it for long, so as not to get infatuated, because it doesn't fit.

I've been tempted to buy here, but I wanted to ask you guys for your experience.

https://hifivvaudio.es.aliexpress.com/store/group/Doble-OP-AMP/1799190_501911048.html?

What you talking about?