"Jim Lesurf" wrote in message

In article
, Arny
Krueger
wrote:
"Jim Lesurf" wrote in message

In article , Dave
Plowman (News) wrote:
I need to knock up some stereo (domestic) line level
amps with a gain of 0-10dB. Using a +/-15 volt supply.
Anything better than the ol' NE 5543 for this these
days?

FWIW I always preferred the Hitachi 12017. But I
realise that this is a somewhat unusual choice. :-)

Looks like it is purpose developed for RIAA preamps.

Yes. That was the intent of Hitachi. :-)

However experiment showed that with suitable tweaking of
the stabilisation network it works nicely as a buffer of
voltage gain stage.

It seems to be happy with somewhat higher VCC.

Yes. IIRC I used to use it with +/-20V lines.

Reading the data sheet, I see no info about one of the
NE5532/NE5534's long suits, which is low distortion into
low impedance loads.

Afraid I can't recall all the measurements I made. But
the specs for the Armstrong 732 showed I got less than
0.005% 20Hz-20kHz into the 10k IHFA load. For up to over
10Vrms IIRC.

5534s and 5532s can provide 10 volt signals into 1K ohm loads, even at
high frequencies. This op amp looks marginal for professional use.

That was of course going though more than one 12017. I
think it also worked fine into much lower loads than 10k
provided you didn't ask for +/-20V. And I think it was OK
down to about 1k load provided you only wanted a volt or
two. But I can't now recall details. Certainly at the
time I preferred it to the competing op amps.

Looks good for consumer and "in the box" applications. In pro applications,
many designers would use 5532s for output buffers, following it.

I guess most people never considered trying it as a
general amp due to the presentation being for RIAA. But I
noticed the high rail, low noise, etc, and found it
responded well to being experimented with. Hence came to
prefer it.

It is hard to tell how its noise performance shapes up in professional
applications, and flat response.