[joe_cool]

Quote:

Originally Posted by pulsar08 /img/forum/go_quote.gif Can I use my opa627 and ad8610 on adapters and ad823 which I bought for my pimeta v2 safely in my little dot I+? I read somewhere that fet input opamps are more fragile so I don't want to kill them. I've tried lt1364, lme49860, opa227, ad8599, and opa2132 I would have to say I prefer the opa2132 the best so I was thinking the opa627 would probably be amazing.

I thought the OPA627 was clean but boring, OPA134 was honkey, and OPA604 was OK. AD8610 and AD825 I like better. LME49710 is best in most cases.

 

[Spacehead]

Quote:

Originally Posted by pulsar08 /img/forum/go_quote.gif Can I use my opa627 and ad8610 on adapters and ad823 which I bought for my pimeta v2 safely in my little dot I+? I read somewhere that fet input opamps are more fragile so I don't want to kill them. I've tried lt1364, lme49860, opa227, ad8599, and opa2132 I would have to say I prefer the opa2132 the best so I was thinking the opa627 would probably be amazing.

I change so much op amps that they get broken pretty soon. I guess op amp fails when it puts out full rail voltage to another channel. nothing can be done then?

If that amplifier is optimized for jfet op amps, then you can change them freely I think.

Did you check dc offset when you tried LME49860 and AD8599. They are bipolar op amps and don't work too well on jfet optimized amplifier.

What headphones you have? OPA2132 can be fine if the bass doesn't get messy, headphones should be very bright?

 

[leeperry]

BTW, is there a single version of 4580? I'd like to try that if it even exists.
Quote:

Originally Posted by Spacehead /img/forum/go_quote.gif Do you ever think how your music goes through some dirty solder joints and possibly long thin wires and gets ruined this way? It is just ugly.

indeed, but we still got plenty of "headroom" distortion-wise IMO...listen to those 49720/49990 opamps, uber-low THD = ear-splitting bright trebles and bass shy to the utmost..

LME49990 Audio Op-Amp - better than AD797? - diyAudio
Quote:

lower distortion does not always equate to better sound.

the other day I went to an audio repair shop, and the guy had built his own preamp/amp, there was *ONE* single transistor in his amp...fed from a toroidal PSU w/ a whole bunch of huge caps to stabilize it. He was clearly an advocate of the minimalist approach...show him a dual discrete opamp and he'd have a seizure for sure

 

[pulsar08]

The dc offset with lme49860 was ~0-1 both channels, ad8599 was ~1/3, lt1364 was 36mV but I figured that was safe with only 32ohm impedance. I gave ad8610 a quick listen and it was pretty bad. opa627 otoh is by far the best. nothing else I've used is anywhere close. This is with a modded x-fi using lme49860 as source and ms1i's. The little dot tubes are Amperex 6ak5w 5654 made in GT. Britain.

 

[weibby]

I can't seem to find it anywhere.

wanna roll my opamp on the mini3 for testing purposes..do you guys know where i can get a DIP to SMD socket?

 

[Spacehead]

Quote:

Originally Posted by weibby /img/forum/go_quote.gif I can't seem to find it anywhere. wanna roll my opamp on the mini3 for testing purposes..do you guys know where i can get a DIP to SMD socket?

Sijosae knows:

I think for reliability that socket needs to be glued to the pads so it can withstand the pulling and pressing forces.

I have made my own dip to smd adapter but it is ugly and has too long wires. I should have made that sijosae socket. I used epoxy for gluing.

There is something:
DIP to SOIC IC Adapters from ePBoard Design to convert SOIC, SSOP, TSSOP, VSOP, MLP, PLCC, CLCC, QFN, SOT, SC, TVSOP, TQFP, LQFP, PQFP, VQFP, TSOPI, TSOPII.
But it is 10 dollars.

 

[leeperry]

Quote:

Originally Posted by weibby /img/forum/go_quote.gif a DIP to SMD socket?

Browndog DIP8 to SO8 Adapter

 

[K3cT]

My op-amp rolling days are over as I plan to build the discrete β22 next but throughout my experience so far, I say just get yourself a piece of ADA4627-1 and be done with it. These are the most well-balanced sounding op-amps among everything I've ever heard. Runner ups are AD8597 and AD797BRZ.

 

[weibby]

Thanks guys!

 

[buz]

How much better than the AD797BR would the ADA4627 be? That one is seriously expensive and does not look to be available in DIP at all...

 

[Mad Max]

Quote:

Originally Posted by buz /img/forum/go_quote.gif How much better than the AD797BR would the ADA4627 be? That one is seriously expensive and does not look to be available in DIP at all...

4627-1BR is more balanced and neutral than 797BR with better, more extended treble. Give it a try sometime! =]


Quote:

Originally Posted by K3cT /img/forum/go_quote.gif My op-amp rolling days are over as I plan to build the discrete β22 next but throughout my experience so far, I say just get yourself a piece of ADA4627-1 and be done with it. These are the most well-balanced sounding op-amps among everything I've ever heard. Runner ups are AD8597 and AD797BRZ.

Add 8091 and metal can 744 to that list.

 

[buz]

Mhh farnell wants 45USD for the 4627 in Switzerland. And then it's not even DIP

. I think I'll pass for now.

 

[12Bass]

Interesting comments regarding the ADA4627-1.... Didn't find the ADA4898-1 to be that impressive. Although I don't usually like to generalize, it seems that FET op amps are often not as transparent/uncolored as the better bipolars. Perhaps the ADA4627-1 bucks that trend?

 

[Mad Max]

Quote:

Originally Posted by 12Bass /img/forum/go_quote.gif Interesting comments regarding the ADA4627-1.... Didn't find the ADA4898-1 to be that impressive. Although I don't usually like to generalize, it seems that FET op amps are often not as transparent/uncolored as the better bipolars. Perhaps the ADA4627-1 bucks that trend?

 

[leeperry]

Quote:

Originally Posted by K3cT /img/forum/go_quote.gif just get yourself a piece of ADA4627-1 and be done with it.

A or B? any audible diff?

tried LT1028AC?