Op Amps

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"mcp6453" <mcp6453@earthlink.net> wrote in message
news:4103EE08.6A67@earthlink.net

> The 5532 was a revolutionary op amp for audio in its day. The next
> landmark that I recall seems to be the AD797. What's a good op amp
> today for 1) low noise, 2) good sonic characteristics suitable for
> professional audio, and 3) high output drive?

If you open a lot of boxes made today, you'll still find a lot of 5532s.

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"Arny Krueger" <arnyk@hotpop.com> wrote in message
news:nsSdnet06q3Tbp7cRVn-sA@comcast.com...
> "mcp6453" <mcp6453@earthlink.net> wrote in message
> news:4103EE08.6A67@earthlink.net
>
> > The 5532 was a revolutionary op amp for audio in its day. The next
> > landmark that I recall seems to be the AD797. What's a good op amp
> > today for 1) low noise, 2) good sonic characteristics suitable for
> > professional audio, and 3) high output drive?
>
> If you open a lot of boxes made today, you'll still find a lot of 5532s.
>

mostly SMTs it seem to me, making them unrepairable to mere mortals.

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On Sun, 25 Jul 2004 14:07:33 -0400, "Tim Perry"
<timperryspammenot@adelphia.net> wrote:

>"Arny Krueger" <arnyk@hotpop.com> wrote in message
>news:nsSdnet06q3Tbp7cRVn-sA@comcast.com...

>> If you open a lot of boxes made today, you'll still find a lot of 5532s.

>mostly SMTs it seem to me, making them unrepairable to mere mortals.

I've had good luck cutting the legs off up near the body, grabbing
them one at a time and unsoldering, then quickly clean and "flatten"
each solder pad.

It helps to glue the replacement down first. Good fortune,

Chris Hornbeck
"Vote or Die" - P. Diddy

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In article <ce0uc3$ei7$1@panix2.panix.com>, kludge@panix.com says...
> Arny Krueger <arnyk@hotpop.com> wrote:
> >"Tim Perry" <timperryspammenot@adelphia.net> wrote in message
> >
> >> mostly SMTs it seem to me, making them unrepairable to mere mortals.
> >
> >Either live with it, or stop being a mere moral! ;-)
>
> http://www.chipquik.com. How I learned to stop worrying and love SMT.
> --scott
>
>
Really Scott,

I've looked at their stuff. How does it work? I have spent a fortune on
various bits of de-solder kit with only semi-satisfactory results. The
main problem I have with SMT is having to buy a new Pace "puck" for each
different package!!

Pip pip
--
Chris Notton
Replace "nospam" with my surname to reply by email
Sostituisca il "nospam" con il mio cognome per rispondere
}<////(*>

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You certainly can use 2017's and 217's at unity gain, and lots of
engineers do when micing sources with lots of hf energy. People like
George Massenburg, to name one.

Roger

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Chris <chris@nospam.net> wrote:
>In article <ce0uc3$ei7$1@panix2.panix.com>, kludge@panix.com says...
>>
>> http://www.chipquik.com. How I learned to stop worrying and love SMT.
>
>I've looked at their stuff. How does it work? I have spent a fortune on
>various bits of de-solder kit with only semi-satisfactory results. The
>main problem I have with SMT is having to buy a new Pace "puck" for each
>different package!!

It really works. You still need a vacuum tool (the cheap hand Paladin
or Soldapulit is fine), and you still need a temperature-controlled iron,
but the stuff makes it surprisingly easy to remove SMT parts. It's a
bismuth alloy that mixes with the solder to form a very-low-melting-point
metal, so that the stuff can be easily kept molten for a long time even
at fairly low temperatures. The only catch is getting all of it off with
vacuum and braid afterward.

I would NOT want to use it for a million-pin microprocessor, but for the
occasional transistor or op-amp now and then, it makes it possible to do
clean rework in the field without a huge investment in a rework station.
It's not a substitute for the Pace at all, but it's a great thing for
small work on a budget.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Archived from groups: rec.audio.pro (More info?)

mcp6453 wrote:

> The 5532 was a revolutionary op amp for audio in its day. The next
> landmark that I recall seems to be the AD797. What's a good op amp today
> for 1) low noise, 2) good sonic characteristics suitable for
> professional audio, and 3) high output drive?

BB x134, AD opa176, AD opa275, BB OPA x604 and some 553x's all seem to
do well in listening tests if different contexts and applications. It
can be easier to determine that swapping them around sounds different
than to determine which is best for what and in what combination.

I was recently on a listening test panel, and having supplied some of
the opamps out of my component drawer I also got information on what
actually had been preferred. The overall winner was a one of each of a
pair of those mentioned - one of them being from my drawer, the runner
up had one of two opamps being a 5532 of unknown origin. it is about
actual circuit and context. The combination I had expected would be best
was the runner down .... it was a good learning experience to listen
blind.

OPA 176 was not a part of that listening test, but it is a part in some
of my DIY and not scheduled for replacement. It is not just half a 275,
they improved it a bit when re-doing it anyway.

I know which I will order when I have to supplement that component
drawer with GP opamps, to some extent that is based also on that
listening test as well as on good performance in other devices in this
household, but there may be something else that is better, or some
combination where it is a poor choice.

A one opamp riaa like the NAD PP1 can be very revealing of opamp
differences in the actual circuit. Your mileage may vary wildly.


Kind regards

Peter Larsen



--
*******************************************
* My site is at: http://www.muyiovatki.dk *
*******************************************

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"Geoff Wood" <geoff@paf.co.nz-nospam> wrote in message
news:HMKNc.836$zS6.103416@news02.tsnz.net

> Any suggestions for mainstream equivs for
> JRC / NJM 2068 and 4565 ? Must be avail SO8

> For a Mackie 1402VLZ with blown summing bus, presumably result of
> soft-drink ingress....

In the current context, a NJM 2068 is *mainstream* . ;-)

It shows up in a lot of audio production gear, and it is said to be widely
used by Marantz in their gear.

Search by "2068" at http://www.njr.co.jp/cgi-bin/search_e.cgi for a spec
sheet.

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"Geoff Wood" <geoff@paf.co.nz-nospam> wrote in message
news:fcNNc.856$zS6.106960@news02.tsnz.net
> Arny Krueger wrote:
>> "Geoff Wood" <geoff@paf.co.nz-nospam> wrote in message
>> news:HMKNc.836$zS6.103416@news02.tsnz.net
>>
>>> Any suggestions for mainstream equivs for
>>> JRC / NJM 2068 and 4565 ? Must be avail SO8
>>
>>> For a Mackie 1402VLZ with blown summing bus, presumably result of
>>> soft-drink ingress....
>>
>> In the current context, a NJM 2068 is *mainstream* . ;-)
>>
>> It shows up in a lot of audio production gear, and it is said to be
>> widely used by Marantz in their gear.
>>
>> Search by "2068" at http://www.njr.co.jp/cgi-bin/search_e.cgi for a
>> spec sheet.
>
> Looking for something available locally - Radiospares or Farnell.

The classic 5532 might not be a bad choice. The input impedance and offset
current specs for both parts are similar. The 5532 is slower, and has a
smaller GBW product, but that probably won't matter in most applications.
The 5532 draws more current, so if you swap a lot of them, it could matter.

Archived from groups: rec.audio.pro (More info?)

In article <290720042311423260%ulyssesnospam@rollmusic.com> ulyssesnospam@rollmusic.com writes:

> I asked them for a sample and they sent it, but they also put me on
> their mailing list against my explicit protests.

Maybe I should be thankful for small favors. It probalby wouldn't help
much for desoldering tubes anyway. <g>



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However, until the spam goes away or Hell freezes over,
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