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Burn-in times for AD8620, 8610, etc. opamps

post #1 of 24
2/17/10 at 6:17am
Thread Starter 
I'm experimenting with AD8620 and 10s for the first time. I've been burning them in for about 30 hours but they still sound way too "loud". I actually prefer forward, "lively" SQ to "warm" and "laid back" (aka Burr-Brown). But I'm not sure how much further the AD8620s will "quiet down".
Please share your experience on these models or the burn-in topic in general.
Thx!
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post #2 of 24
2/17/10 at 7:33am
Not many people believe in burn-in for opamps. Caps, drivers, tubes make a notable difference - but solid-state devices don't really burn in. Nothing changes chemically or electrically - measurably and (for most people) audibly - in silicon circuits. Even if anyone claimed they could hear a difference, 30 hours should be plenty.
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post #3 of 24
2/17/10 at 7:53am
The AD8620 should be bright and forward, especially the AR(Z) series. I have never noticed any sign of burn-in while using op-amps. Where did you get them from? Maybe they are fake?
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post #4 of 24
2/17/10 at 11:04am
another vote for 'no such thing as burn-in' on solid state devices.
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post #5 of 24
2/17/10 at 12:42pm
Quote:
Originally Posted by majkel View Post
The AD8620 should be bright and forward, especially the AR(Z) series.
Care to explain the "especially the AR(Z) series"?
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post #6 of 24
2/17/10 at 12:54pm
I have the 8620/8610 in my Pimeta. IMO, even assuming burn-in is purely psychological, burn-in won't occur with this op-amp. Still sounds very detailed/edgy/analytical to me, even after two years of listening to it. I'm convinced it's just the way it sounds and you either like it or you don't. Personally I like it in small doses, but for extended listening periods I usually choose something else from the arsenal.
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post #7 of 24
2/17/10 at 12:57pm
Quote:
Originally Posted by amb View Post
Care to explain the "especially the AR(Z) series"?
The BRZ sounds a bit warmer and smooth to me. I've got both in my collection and compared them in the DAC filter/buffer section.
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post #8 of 24
2/17/10 at 1:09pm
About 1000 hours.

MOAR BURN-IN!!!!
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post #9 of 24
2/17/10 at 1:21pm
Quote:
Originally Posted by Juaquin View Post
Not many people believe in burn-in for opamps. Caps, drivers, tubes make a notable difference - but solid-state devices don't really burn in. Nothing changes chemically or electrically - measurably and (for most people) audibly - in silicon circuits. Even if anyone claimed they could hear a difference, 30 hours should be plenty.
Capacitors are a "solid-state device"
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post #10 of 24
2/17/10 at 2:13pm
I believe that your hearing is a chemical process after the conversion of the sound pressure waves to electrical pules in the inner ear. Being a chemical process, hearing is influenced by hormonal changes or chemical imbalances.

Is it possible that "hearing memory" is compared to the present state of hearing, which may or may not be the same based on present "chemical state" in your body, and the results may be perceived as different even though it is the same signal?
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post #11 of 24
2/17/10 at 4:02pm
Quote:
Originally Posted by limpidglitch View Post
Capacitors are a "solid-state device"
Correct, I should have been more specific and said "solid-state integrated circuits".
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post #12 of 24
2/17/10 at 4:33pm
If you prefer the laid back sound of the Burr Brown IC's why are you using the AD ones then?
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post #13 of 24
2/17/10 at 4:55pm
What's gonna burn in later in the list, the pots? The amp cases? Remember the earth is flat, not round. duh
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post #14 of 24
2/17/10 at 5:07pm
I'm a huge believer in burn-in. The more the better I don't give any of my new gear a critical listen until at least 40 hours have gone by.

Totally subjective opinion though, until more research is done on the what happens to components over time on an "electron cloud" level of theory.
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post #15 of 24
2/17/10 at 5:08pm
Quote:
Originally Posted by Juaquin View Post
Correct, I should have been more specific and said "solid-state integrated circuits".
But then, when is an integrated circuit not solid-state?

But yeah, I don't think IC's 'burn-in' at all, if you don't like how it sounds now, that won't likely change.


PS: Ok, maybe motions sensors and acelerometer IC's aren't really solid-state...
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