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Old 30th December 2002, 12:28 PM   #21
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Originally posted by ppl
... LM-353,LM-356,...

For those who wonders, he means LF351 and LF356.......
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Old 30th December 2002, 12:55 PM   #22
ppl is offline ppl  United States
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yes somewhat true but the LM-353 if i am not mastakeken is a dual LM-351. and i did try this on several duals. Thanks peranders for the Correction
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Old 30th December 2002, 05:59 PM   #23
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AD825 is also a good op, but which one thats better i think depends on the application.

I prefer opa627 over the 825.

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I prefer 825 over 627!!!
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Old 30th December 2002, 11:15 PM   #24
ppl is offline ppl  United States
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I like the AD-8610 Over the AD-825 and OPA-627, But the 8610 is supply voltage limited to +/- 13 Volts rather than +/- 15 Volt supply rails of the other two Devices. However the AD-8610 swings to within 1.2 Volts from the Rails.

Sound quality of the AD-8610 and the Dual AD-8620 are amoung the Finest available from an opamp. None of the undesireable qualities that some atribute to Opamps are nott presentt with this device. Smoothness defines the sound with Imaging and resolving of detail first rate. none of the sibelense of the AD-825 and to a lesser extent the OPA-627. also the 8610 has full bodied Bass, another quality that all but the best Op Amps lack. IMHO the AD-8610 and the AD-843 are the Finest Op Amps for Audio you can get whitch one depends upon what kind of sound quality desired and what application the device is used. some circuits like simulated inductors are best with a High speed Video grade Op Amp. so are some active filters. but for general line level Gain the 8610 and 843 are my top choices. if a dual is required the AD-8620 is a Dual AD-8610. the Dual AD-8620 is good for equipment upgrades that used low performance duals like the 1458, 4558 and similar. Thay work wonders in I/V convertors.

RIAA and Mic gain stages are best with Ultra low noise BJT input devices like the LT-1028 and the AD-797
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Old 31st December 2002, 01:46 AM   #25
Wombat is offline Wombat  Germany
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Did you try the AD826. If you like compatiliby it has to be at least
+/- 15V and this is what i pray al the time.
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Old 31st December 2002, 08:08 AM   #26
ALW is offline ALW  United Kingdom
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Default Op-amps for audio

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RIAA and Mic gain stages are best with Ultra low noise BJT input devices like the LT-1028 and the AD-797
Has anyone ever compared these two devices sonically - I've never had good results with the AD797, finding it soft, woolly and generally lacking in musicality.

I'd agree with ppl above, the AD86x0 are the best op-amps I've used, bar none in high level applications.

I also like the AD825, but it can be sibilant, with a bright sound, despite some very promising attributes for audio (wide open-loop bandwidth).

Andy.
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Old 31st December 2002, 11:22 AM   #27
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AWL> I tend to agree with you on the AD-825 it is quite sibilant, to the Point of being irritating. the AD-797 is also somewhat sibilant. I don't What the Term Woolly is, But i liked the LT-1028 In my last Mag Phono Circuit Better than the AD-797. This was a standard jfet Follower driving each of the Op-Amp inputs. this circuit was to present a low impedance load to the Opamps for lowest noise while the Low input Bias currents of the Jfets allow for DC coupling. This Circuit was real quiet in real world testing like -90 dB below 500 mV. Hear the LT-1028 sounded alot more detailed and articulate than the AD-797. Both were quiet. The LT-1028 was in the Cer Dip Package and the AD-797 in the P-Dip If that matters?
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Old 31st December 2002, 03:03 PM   #28
ALW is offline ALW  United Kingdom
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Default Thanks ppl

By woolly, I mean soft sounding and lacking in dynamics - a bit 'muffled' I suppose.

I've never tried the LT1028, so I will secure some samples and have a play.

One thing I would say about the AD825, more than any other op-amp I've used, it seems t benefit from significant warm-up times.

No idea why, but cold they are horrible, but once warmed up (and this can seem to take hours, to days!) they can be very good. I think careful application and tailoring of circuitry can yield superb results, but it's not quite so 'drop-in' a replacement.

There's some intersting TI devices coming out now that may be worthy of investigation, some offering very high speed and extremely low noise. All SMD though, and tiny packages.

Andy.
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Old 31st December 2002, 04:46 PM   #29
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ALW> thanks for the tip on TI devices any part Numbers? Yes the AD-825 is ultra critical of the application and will require a long warmup like you say at least hours. Also a Current source is a great help with this and Other Op-Amps thanks for the Termanology inlightenment, yes the AD-797 is Kind of Bland sounding But i gess that is what attracts so manny people to it. Me i like the LT-1028 alot Better and i am not that much of an LTC fan. Except for the LT-1122,LT-1010,LT1085,LT-1033,LT-1210 and for High gains the LT-1028 and maybe the LT-1115.
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Old 31st December 2002, 07:13 PM   #30
Pan is offline Pan  Sweden
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I have a LC Audio DAC with PCM1702K, AD811 and BUF634,

it sounds like S_H_I_T up to ... let´s say an hour or so, then it sings. So when I use it I leave it on 24/7 (of course :-).

/Peter
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