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2x TO99 to dip 8 adapters - Page 2

post #16 of 28
2/22/10 at 6:07pm
well, this is not really open for debate to me tbh...it's clearly not placebo on my cd1k, dual opamps *are* nasty.

if you look here: Precision Amplifier - Wide Bandwidth - OPA1612 - TI.com
Quote:
The dual version features completely independent circuitry for lowest crosstalk and freedom from interactions between channels
needless to say, they didn't bother doing it on most of their older chips....comparing 2*OPA132 Vs 1*OPA2132 is quite eye popping
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post #17 of 28
2/22/10 at 6:52pm
Funny thing is that, even though the OPA1612 is supposedly two separate circuits internally, is it still inferior to using a pair of OPA1611s. I'm not one to use two chips instead of one unless there is an an advantage. The difference in channel separation and openness is clearly audible.
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post #18 of 28
2/22/10 at 7:04pm
I agree, 1612 is still much worse than 2*1611...but this time TI comes clean about the issue, even if they failed overcoming it

I hate their opamps anyway..maybe some top range OPA627 would make me change my mind, though.
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post #19 of 28
2/22/10 at 9:38pm
Thread Starter 
So the browndog adapters wouldn't be ideal then for the LT1028? Also I am not using this for a headphone amp but for my maverick d1 dac's preamp. It's a hybrid which uses a tube and ss together for the output. Will that still cause gain issues? Im a nub BTW
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post #20 of 28
2/22/10 at 10:18pm
Quote:
Originally Posted by muad View Post
I've scoured the net and nothing Anyone know where I can pick one of those up? Otherwise I gotta but auzentech's overpriced opamps.
Send me your address and I will drop one in the Mail for you.
RC
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post #21 of 28
2/22/10 at 10:20pm
well, LT1028 is pesky and likes to oscillate...it's clearly not as easy to use as a Burson v2 for instance.

I dunno how your preamp is implemented, ask the manufacturer what the gain is? you can make the 1028 unity gain stable by adding a 510Ω resistor on pin 3...but you'd need to check for oscillation w/ an oscilloscope anyway.
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post #22 of 28
2/22/10 at 10:44pm
Quote:
Originally Posted by 12Bass View Post
Funny thing is that, even though the OPA1612 is supposedly two separate circuits internally, is it still inferior to using a pair of OPA1611s. I'm not one to use two chips instead of one unless there is an an advantage. The difference in channel separation and openness is clearly audible.
Many are like this as we have noted many times in the opamp thread.
Dual single channel are usually preferable to a single dual channel.
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post #23 of 28
2/23/10 at 1:59am
Thread Starter 
Well I guess I'll try a bunch of opamps first, and if nothing clicks with this dac I'll maybe go for the burson.
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post #24 of 28
2/23/10 at 5:47pm
Discrete opamps are just another flavor. Some like them and some do not...
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post #25 of 28
2/25/10 at 7:17pm
I think I would need to refine on what I previously said...first, most of the LT chips weren't designed for audio, so they'd be better left aside...there is no question that 2*LT1363 sound far better than 1*LT1364...the center channel is just one big mess on the latter, but this opamp was meant to drive cables in the first place hah

but a good audio opamp such as the LM4562MA manages to give a wide SS, and yet keep the center channel busy....I read some headphones reviews where the tester would say that some phones had such a wide SS that the center channel would just feel like one big "hole"...that's basically what dual opamps have always done for me.

so instead of having the audio on the extreme sides and the center channel "empty", I get a much narrower center channel on the 4562, but it's got its charms too! and I still got stuff going on in the extreme sides of the SS, as we all know how wide the SS is on the 4562...and it even sound amazingly good on a nice regulated linear dedicated PSU

I'm still undecided on how I prefer my audio, but having an empty center channel is prolly not such a great idea either...and it'd be far more fatiguing on headphones for the brain to analyze a dual-mono signal, maybe a nice dual opamp gives a more "homogenous" and "coherent" stereo image.
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post #26 of 28
2/25/10 at 9:49pm
Well considering the CM8768 was used on some of the cheapest cards available perhaps you should get a good source with a decent DAC to do some testing. Using a $5 opamps on a $10 card is sort of missing the boat.

Yes, we know your undecided as you keep changing your mind every day and you contradict what you said previously which really just makes people ignore what you say...Sorry.


Actually quite a few of the LT chips were designed for audio use. Also, the more experience you get you will realise that many of the best opamps for audio were not specifically designed for audio use. As far as the dual vs single debate, that was discussed long ago in the opamps thread...nice to see you are catching on and listening to people with much more experience then you. It would definately save you time.
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post #27 of 28
2/25/10 at 9:58pm
Quote:
Originally Posted by muad View Post
Well I guess I'll try a bunch of opamps first, and if nothing clicks with this dac I'll maybe go for the burson.
Don't get too caught up in the idea of the Burson. They are just another flavor of opamp and in many cases they provide lower specifications then their chip based counterparts. I have tried all the audio GD ones, Burson models and since have been testing some custom built discretes which sound quite good. Personally, I think the sweet spot may be a combination of the two depending on what type of signature your after.
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post #28 of 28
2/25/10 at 10:28pm
after a few comparisons, I just don't like dual opamps...I much prefer to have a big hole in the center channel, so I stand by everything I said earlier! singles opamps or nuttin'...a 4562MA clearly cannot touch 2*797B
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