linepre opamps, which ones do you use? - diyAudio
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Old 12th January 2004, 07:46 PM   #1
matjans is offline matjans  Netherlands
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Default linepre opamps, which ones do you use?

hello all,

i have recently finished my latest creation, an opamp based linepre (no buffer). I must say i'm pretty content with the results so far.
I imagine i'm not the only one (carlosfm?) using an active pre sooooo....

What i'd like to know is which opamps you guys have used and what you think of them.

www.headwize.com has a lot of information on using opamps as headphone amplifiers but little info on linepre's.
i've tested the following opamps:

opa2132p / AD823an / op275 / jrc4560D (used in philips' cd723) --all dual and opa627 & 637 singles.

I also slipped a dip8-socket in my cd-player and started testing. I found that i liked the sound most with an ad823 in the CDP and OP275 in linepre.
I guess I just like the analog devices' sound.

So people, do you know of any nice opamps?
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Old 12th January 2004, 08:57 PM   #2
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Have you tested AD8610 and AD8620?
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Old 12th January 2004, 09:29 PM   #3
matjans is offline matjans  Netherlands
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not yet, i will (if i can get them)

edit: they're only available in SOIC packages.
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Old 12th January 2004, 10:13 PM   #4
Nuuk is offline Nuuk  United Kingdom
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Don't forget (or discount) the good old 5534. You may be surprised!
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Old 12th January 2004, 10:54 PM   #5
Cobra2 is offline Cobra2  Norway
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Quote:
Don't forget (or discount) the good old 5534.
Ouch...I have "optimized" too many units, and sometimes put back the 5534 when selling things...I never found them good sounding, regardless of psu, caps, bypassing or whatever...
So now I do with them as you should do to oilpumps in old engines; use a hammer on them, so you will not be tempted to put it back!

Arne K
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Old 12th January 2004, 11:44 PM   #6
usekgb is offline usekgb  United States
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I recently replaced a TL082 with a OPA627 in a LF boost circuit. I thought the TL082 actually sounded better, so I put it back. This was a bit of a surprise to me, but if it works I'll use it.

Cheers,
Zach
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Old 12th January 2004, 11:57 PM   #7
Felix is offline Felix  Hong Kong
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Quote:
Originally posted by matjans
not yet, i will (if i can get them)

edit: they're only available in SOIC packages.
The browndog adaptor would be useful to convert SOIC to DIP .

http://cimarrontechnology.com/index....PROD&ProdID=12
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Old 13th January 2004, 03:39 AM   #8
GregGC is offline GregGC  Canada
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Quote:
Originally posted by Felix


The browndog adaptor would be useful to convert SOIC to DIP .

http://cimarrontechnology.com/index....PROD&ProdID=12
The tracks of the pcb adapter are too long for my liking (especially if you use some of those super fast video opamps). I'd just solder the SO package to a normal DIP socket. You'll have to spread the pins of the opamp a bit but you end up with a lot shorter leg length and cost a lot less.
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Old 13th January 2004, 12:48 PM   #9
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Quote:
Originally posted by Cobra2

Ouch...I have "optimized" too many units, and sometimes put back the 5534 when selling things...I never found them good sounding, regardless of psu, caps, bypassing or whatever...
So now I do with them as you should do to oilpumps in old engines; use a hammer on them, so you will not be tempted to put it back!
Arne K

Same experience here.

Matjans, IF you like the AD sound, test the AD826 (DIP) or AD825 (SMD only).
I don't like the AD sound, really.
No midband, too recessed.
Good for bright speakers?
BTW, the OP275 is not like these, but it's too bright for my taste (it reminds me the NEs and the JRC/NJM2114).

Seriously, try the LM6172 (double) or LM6171 (single) and OPA627, OPA2132, OPA2604.

Oh, as for that JRC4560D, you can use the hammer on it.
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Old 13th January 2004, 02:08 PM   #10
GregGC is offline GregGC  Canada
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I think the sound of the opamp depends on the specific circuitry one is used in. My experience is that LM6172 sounded with more pronounced lower end (which gave the impression of a recessed mids) while the AD's with clearerer mid and not as harsh highs. It was a single opamp filter after the DAC of a CD player. A matter of preference depending of the characteristics of the rest of the setup).

Greg
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