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From: dca@edison.UUCP (David C. Albrecht)
Newsgroups: net.audio
Subject: Re: Re: Tighter bass and edgeless piano
Message-ID: <554@edison.UUCP>
Date: Wed, 25-Sep-85 17:07:38 EDT
Article-I.D.: edison.554
Posted: Wed Sep 25 17:07:38 1985
Date-Received: Sat, 28-Sep-85 06:56:49 EDT
References: <511@decwrl.UUCP>
Organization: General Electric Company, Charlottesville, VA
Lines: 17

> For another $5, you could replace the opamps.  The problem is that I
> don't know much about opamps and could not tell you which ones will
> have lower distortion than the NE5532's Phillips uses.  Besides parts
> and labor, you are paying mod houses for their intelectual property.
> 
The NE5532 is a 8 pin version of the NE5534 which is internally
compensated to unity gain.  The NE5532 is a relatively recent ultra
low noise (5nV/((Hz)^1/2)) high slew rate (9V/us) op-amp.  While it is
certainly possible that there are better op amps the NE5534 is a
quite good one.  THD of a RIAA preamp using a single 5532 showed less
than .01% across the audio spectrum with 10V P-P into 600 ohms.  With
a 10K ohm load THD is less than .005%.  Either .01% or .005% are so
down that improvements are likely moot excercises.  Sources for
the data were the SIGNETICS ANALOG APPLICATIONS MANUAL and the
SIGNETICS ANALOG DATA MANUAL.

David Albrecht


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