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Author Topic: The Opamp Thread  (Read 9053 times)

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Anaxilus

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Re: The Opamp Thread
« Reply #30 on: November 16, 2013, 07:08:11 AM »

Maybe it's because we're less interested in lording one over another?

I'm considering replacing the ADA4898s with something less power-hungry in the Leckerton, on par with OPA209 both in power use and sonically.
Any recommendations? OPA209 is of course out, that one is way too sensitive to cellphones.

ADA4898 (~8 mA/ch) is about as power hungry as AD797 (~8 mA/ch) or OPA627 (~ 7 mA/ch), which reduces UHA-6s mkII to ~8 hours instead of 24+ hours w/ OPA209 (~2.5 mA/ch).
Plus that one is rather bass-oriented, it sounds like a FET opamp with a bit different (less "oily") timbre, but it's not specified which input stage. Likely JFET.

AD8610s are more "upper midrange" from my experience than I'd like, but they are 3 mA/ch, close to OPA209.
How is ADA4627 sounding in that amp? Looks like ~7.5 mA/ch; on par with ADA4898, too short.

Anything else?

You using the DAC as well?  If you had a better external DAC, you'd get more time out of the amp w/o limiting your opamp selection.
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AstralStorm

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Re: The Opamp Thread
« Reply #31 on: November 16, 2013, 08:58:19 AM »

No, I'm not using the DAC when I need the battery.

Also, the DAC reduced OPA209 to 18 hours and ADA4898 to 6-7 hours, so it is not that high a drain in comparison to the opamps.
SPDIF drains a lot though, both coax and optical. (10h and 4h respectively) But for these I don't use the battery.
« Last Edit: November 16, 2013, 09:05:32 AM by AstralStorm »
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kiteki

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Re: The Opamp Thread
« Reply #32 on: November 17, 2013, 01:28:41 PM »

Maybe it's because we're less interested in lording one over another?

////

AD8610s are more "upper midrange" from my experience than I'd like, but they are 3 mA/ch, close to OPA209.
How is ADA4627 sounding in that amp? Looks like ~7.5 mA/ch; on par with ADA4898, too short.

I know what you mean by saying upper midrange.  I can't describe the sound of AD8610 very well, but it's interesting.

What are your personal sonic favourites?  Have you tried many from Linear Tech?
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AstralStorm

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Re: The Opamp Thread
« Reply #33 on: November 19, 2013, 06:50:47 PM »

Not really for either of the questions.

Actually OPA209 sound was excellent, but it was way, no, make that way too sensitive to GSM for a portable amp, which I want to use with a cellphone near.
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kiteki

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Re: The Opamp Thread
« Reply #34 on: November 20, 2013, 11:42:20 AM »

The OPA1611 / 1632 / 1642 variants (I've only heard the OPA1612) are very nice sounding when it comes to sheer transparency, if that's your preference.

LT1028 / LT1128 are nice in that respect as well.  Along with LME49990 I'd say these three are all slightly more transparent than the AD797, unless I've never heard an AD797 in it's ideal circuit as some say it's sensitive, it doesn't seem sensitive to me. -shrug-
« Last Edit: November 20, 2013, 11:53:16 AM by kiteki »
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kiteki

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Re: The Opamp Thread
« Reply #35 on: November 27, 2013, 09:51:37 PM »

I like how JRC have issued a warning about counterfeits, while at the same time they can only link to sellers which have zero stock.  How useful!  "Hello, don't buy our product, it's fake, unless you buy from this seller, Digi-Key, except he never has any stock".

http://semicon.njr.co.jp/eng/MUSES/precaution.html
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kiteki

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Re: The Opamp Thread
« Reply #36 on: November 27, 2013, 10:33:39 PM »

$244.99 for a single pair of op-amp's...

http://www.auzentech.com/site/products/opamp_627sm.php

The 627 touches the heart, there is no price on love ~
« Last Edit: November 28, 2013, 02:51:55 AM by kiteki »
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Re: The Opamp Thread
« Reply #37 on: November 28, 2013, 04:22:48 AM »

Well the TO-99 version is $60 each, and the SM version is $100 (for a better temperature spec?). I guess it's not that far-fetched...
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