Best Opamp for the Pimeta?

[cocolaj]

Is the AD8620 the best opamp for the Pimeta? I myself use the AD8610! Is the AD8620 an aprovement over the AD8610?

 

[colonelkernel8]

8620 is the dual version of the 8610. In the Pimeta, use the 8620 on the stereo channels (it must be a dual opamp on the stereo channels) and the 8610 on the ground channel.

If you are using the 8610 on both, then you have problems friend.

 

[episiarch]

I've tried AD627, AD8620/10, and AD843. I like AD627 best (nice and neutral with perhaps a little warmth), followed by AD8620/10 (a little bit highs-focused (I thought cymbals sounded kind of "splashy") but still a great performer).

But the AD843 is a really neat, gutsy sound if you're less into neutrality than into something with more kick, particularly in the lows. (It was long enough ago now that I don't feel I can describe it with any precision.)

 

[tomb]

I think maybe you mean OPA627, not AD627. The AD843 is definitely an aggressive chip, but it also sucks current out of a battery powered version like there's no tomorrow.

I like the AD8066/8055 the best.

 

[bhjazz]

Some other similar discussions here (use the search feature) mention the OPA627, even though it might take some BrownDog adapters. I will be rolling from the AD8620 to the OPA627 later this year. But I really do like the AD8620. It seems to work well with the HD600s.

BTW: What headphones are you using cocolaj? That will definitely make a difference.

 

[episiarch]

Quote:

Originally Posted by tomb /img/forum/go_quote.gif I think maybe you mean OPA627, not AD627. The AD843 is definitely an aggressive chip, but it also sucks current out of a battery powered version like there's no tomorrow.

Yes, that's what I meant. Oops.

And I should have mentioned that about the 843 - really poorly suited for portable use, and runs quite warm besides.

 

[ChickenGod]

What about the AD8397?

 

[gates_2]

I personally love the 627's in my pimeta, perhaps more so than the 637's, desktop amp, though.


as for 627s + portable, 2x BUFF634 + 627's +class A all around will give ya 4.5 hrs of play time on 2 9 V's... not the longest, but if you are just using it around town during the day, and can charge later on, you are in good shape

 

[vixr]

WOO HOO!!! I'm running these in my PIMETA... sounds pretty darn good.

 

[applegd]

I vote for 637 for L&R, 627 for G.

 

[cocolaj]

Quote:

Originally Posted by colonelkernel8 /img/forum/go_quote.gif 8620 is the dual version of the 8610. In the Pimeta, use the 8620 on the stereo channels (it must be a dual opamp on the stereo channels) and the 8610 on the ground channel. If you are using the 8610 on both, then you have problems friend.

I am using Dual 8610 on the stereo channel and single 8610 on the ground channel. Would switchen til 8620 on the stereo channel improve the sound consideredly?

 

[cocolaj]

Quote:

Originally Posted by bhjazz /img/forum/go_quote.gif Some other similar discussions here (use the search feature) mention the OPA627, even though it might take some BrownDog adapters. I will be rolling from the AD8620 to the OPA627 later this year. But I really do like the AD8620. It seems to work well with the HD600s. BTW: What headphones are you using cocolaj? That will definitely make a difference.

Sorry, I use the HD650

 

[amb]

Quote:

Originally Posted by ChickenGod /img/forum/go_quote.gif What about the AD8397?

I would not recommend the AD8397 in any amp that was not designed to use it. Pimeta is such an amp. Stay with JFET input opamps to avoid excessive DC offset.

 

[Filburt]

The 8620 and 10 are the same op-amp, just the 20 is a dual. I don't think it's a very good op-amp for audio in general; I never quite understood how it came to be popular versus the variety of very well performing op-amps AD produces. Maybe it's just that it was marketed side-by-side to the OPA627 and so got attention.

The best FET-input op-amp around is probably the OPA655; I can't think of anything better at the moment, but they're a tremendous pain to acquire. The OPA656 is pretty easy to acquire and cheap, but not as good, though still I'd imagine considerably better than the common alternatives *shrug*

 

[cocolaj]

Quote:

Originally Posted by Filburt /img/forum/go_quote.gif The 8620 and 10 are the same op-amp, just the 20 is a dual. I don't think it's a very good op-amp for audio in general; I never quite understood how it came to be popular versus the variety of very well performing op-amps AD produces. Maybe it's just that it was marketed side-by-side to the OPA627 and so got attention. The best FET-input op-amp around is probably the OPA655; I can't think of anything better at the moment, but they're a tremendous pain to acquire. The OPA656 is pretty easy to acquire and cheap, but not as good, though still I'd imagine considerably better than the common alternatives *shrug*

Do you know where to buy the OPA656 (or better yet the OPA655)?