[Sam Spade]

Have you seen this already? Guy likens them to Staccatos': https://www.head-fi.org/showcase/staccato-open-sound-hybrid-discrete-op-amps.23982/reviews

But yeah, more Muses03 impressions would be great.

Save your cash till you get a convincing blind test or two that agree they are worth the cash. Preferably double blind test but we know that ain't happening in hifi.

 

[Elegiac]

Save your cash till you get a convincing blind test or two that agree they are worth the cash. Preferably double blind test but we know that ain't happening in hifi.

Mmm, tis a concern.

 

[leeperry]

blind rolling is bound to fail, these aren't lego bricks

replacing 49720 by 49722 is full of win, official drop-in replacement

 

[evonimos]

By the way, the LME49720 is still available in both DIP-8 and SOIC-8 packages, at reasonable prices.

The LME49722 you mentioned seems quite a bit harder to source.

However, if you don't mind fishing around (and paying high prices!), LME49720HA (metal can version) is a really nice fish to catch. For thise who like the sound of this opamp, it's arguably the best version.

 

[Onik]

Burson is releasing V7 Vivid Pro op amps

When?

 

[leeperry]

LME49720HA (metal can version) is a really nice fish to catch

99.99999999999% fakes, 49722 much better anyhow

 

[seamon]

Instead of swapping out random Op-Amps in random amps, shouldn't we vouch for competent designers who understand how each op-amp performs and designs circuits with particular op-amps in mind?
Just a thought.

 

[D1N0]

No

 

[Elegiac]

Look, normally I would agree, but the Geshelli J2S encourages you to do so. They sell two sets of alternative op amps with the unit. I'm pretty sure that a pair of MUSES03 would be no more different to an OPA1656 than an SS3602 or Burson V6 is. The MUSES03 and the OPA1656 are both jfet. I've seen someone running MUSES01 and MUSES02 in the unit, so MUSES03 should also run, based on specs. Maybe there will be a slight increase in distortion, but nothing audible.
I've rolled op amps through an FX-Audio DAC-SQ5 in the past, and each time I heard some obvious change to the sound. Although in the end I ended up using the stock op amps, because they sounded the best, hahaha. Hoping things will be different this time.

 

[leeperry]

Instead of swapping out random Op-Amps in random amps, shouldn't we vouch for competent designers who understand how each op-amp performs and designs circuits with particular op-amps in mind?

fully agreed but 49722 datasheet calls it a drop-in replacement for 49720, specs are much better and SQ astounding IME

 

[povidlo]

Instead of swapping out random Op-Amps in random amps, shouldn't we vouch for competent designers who understand how each op-amp performs and designs circuits with particular op-amps in mind?
Just a thought.

They also design circuits with cost and profit in mind.

 

[seamon]

They also design circuits with cost and profit in mind.

More expensive is not always better. Muses are fairly expensive compared to other opamps but they have some of the worst electric characteristics among audio opamps. Newer opamps like OPA1656, OPA1612 etc. completely destroy the MUSES' old and outdated designs/tech.

 

[bramsat]

Yes the opa 1656 sounds great...buhttps://nl.aliexpress.com/item/1005004940214508.html?spm=a2g0o.order_list.order_list_main.53.f3eb79d2cxcrCu&gatewayAdapt=glo2nldt the JRC 5532DD sounds better on the Aiyima A07 max. Got 3 TPA3255 amps and the Aiyima MAX sounds better on the 32/5A and not on the 36/6A adapter,why i don't no.

 

[povidlo]

Instead of swapping out random Op-Amps in random amps, shouldn't we vouch for competent designers who understand how each op-amp performs and designs circuits with particular op-amps in mind?
Just a thought.

They also design circuits with cost and profit in mind.

More expensive is not always better. Muses are fairly expensive compared to other opamps but they have some of the worst electric characteristics among audio opamps. Newer opamps like OPA1656, OPA1612 etc. completely destroy the MUSES' old and outdated designs/tech.

Did not say expensive is better. You made an argument against opamp rolling saying stock opamps are best since they're designed to be there. I said circuits are designed with budget in mind. To reiterate my point, due to budget constraints a desired/optimal op amp considered by the designer may or may not be included. Supply and other constraints might play a factor as well. That's why I like to roll if possible and determine for myself what opamp setup I like best.

 

[evonimos]

Does the LME49722 comes only in SOIC package?
Also, I looked for it at Mouser and DigiKey and is unavailable (obsolete part).

The LME49720 in DIP8 and SOIC8 package is still available (for ~3 Euro a piece).
Btw, the equivalent LM4562 is also available (for even less).

The are pretty good as JFET input opamps.
Excellent for high-input impedance, low-noise applications.

If bipolar input is not an issue though, I prefer Texas Instruments NE5532.
And for single-channel applications I think it is very hard to beat the NE5534, especially in terms of value.