[PChoon]

Hi guys i need your experience in opamps.
 
i have a graham slee voyager that i really love.
 
recently i tried opening it up to take a look on the insides.
 
and i saw that it has a AD823AN op-amp which i could roll.
 
is there by any chance any one here has tried changing the op-amp?
 
or is there recommendations?
 
thank you.

 

[Lil' Knight]

So I've just found out there is a TI distributor pretty near my place. Thinking of stopping by to pick up some nice opamps and DACs from them.

Anything worth looking at, besides the OPA827, LME49710, LME49720 and LME49990? I know the 49710 and 49720 has metal can package. Any other LMExxxxx series that have this type of package?

 

[leeperry]

don't believe the metal can hype IMO/IME, and OPA1641 should be on the top of your list if you can solder.

 

[Lil' Knight]

How does the OPA1641 stand against the OPA827? I have a boatload of OPA827s, just curious if there is anything else worth considering...

 

[SpudHarris]

don't believe the metal can hype IMO/IME, and OPA1641 should be on the top of your list if you can solder.

X2

1641 is amazing!

 

[leeperry]

Quote:

How does the OPA1641 stand against the OPA827?

I really don't like 827(when rolled blindly

) and just for the record this XMOS based DAC is using OPA1642 as DAC LPF 

 

[Mad Max]

Quote:

How does the OPA1641 stand against the OPA827? I have a boatload of OPA827s, just curious if there is anything else worth considering...

 
827 rules, but needs extra bypass caps to shine.
Not as many as in that linked post, though, LOL!

 

[Lil' Knight]

I really don't like 827(when rolled blindly :rolleyes: ) and just for the record this XMOS based DAC is using OPA1642 as DAC LPF :wink_face:

That's a nice, little DAC. Love the teflon pcb.

I'll pick up some OPA1641s to see how they perform then. Mainly use these opamps in a super regulators and servos in my headamp though.

 

[12Bass]

OPA1641 is decent if low quiescent current is a concern; I prefer the sound of OPA827. That said, I think that ADA4627-1 sounds better than both.

 

[Lil' Knight]

Yet another JFET input opamp... Thanks for the suggestion, gonna order some.

The way AD codename those xxx627xx and xxx637xx make me think they are direct replacement for the 627/637. Not really sure about this though, gonna dig deeper.

 

[Mad Max]

I'd be surprised if they were.

 

[jcx]

I think they are targeted at the same markets, intended to compete with the BB parts
 
one of the biggest advantages of the OPA627/37 is the AC CM input impedance linearity, no good measure is shown on standard datasheets so its hard to say if they're really competitive

 

[Huxley]

Folks a little input please, i have a P4 warbler which i love and im just getting into rolling opamps?

Does anyone know of any fitting guides, or any do's and dont's?

I have ron's topkit on order, along with some OPA627BP

But im also thinking of getting OPA2111AM and OPA1641 to throw into the mix.

Im currently using AD797 with stock buffers and so far im liking the sq improvement, though i do tend to favour a darker presentation.

 

[H22]

A bit new to the thread, been lurking for a while though. I recently put 3 OPA1641's in a PPAv2 style amp, seems to work very well in this amp, but i notice a grainy-ness to the upper-mids, anyone else notice this?
 
joe
 

 

[Armaegis]

Maybe it was distortion?