Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site edison.UUCP Path: utzoo!watmath!clyde!bonnie!akgua!mcnc!ncsu!uvacs!edison!dca 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