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Audio Research SP-3, A, & A1 Modification Instructions
http://www.curcioaudio.com/SP-3%20Mod%20Documentation.pdf
Audio Research SP-3, A, & A1 Modification Instructions Page 1 I. Introduction This document describes a series of modifications for the Audio Research SP-3 preamplifier series that address the phono amplifier, line amplifier, and high voltage power supply. Once completed significant sonic improvements will be gained.
Audio Research SP-3-A-1 modified......... | diyAudio
https://www.diyaudio.com/community/threads/audio-research-sp-3-a-1-modified.125780/
Hi, I own an Audio Reseach SP-3-A-1 that was modified when I purchased it. The changes would appear to be the CAE (Cureio Audio Engineering) modification instructions for changes available over the web. The connections are (I assume) correct because it does play. The work is extremely...
Audio Research SP-3 preamplifier | Stereophile.com
https://www.stereophile.com/content/audio-research-sp-3-preamplifier
We don't know just how low the distortion is in the SP-3's preamp (it was unmeasurable on our modest little Heath Audio Analyzer), but it sounds lower than in any other preamp we have ever heard, if cleanness and musical purity are any indication, which they are. There is less of the things which generally annoy us in phono reproduction, but virtually none of …
Audio Research SP3a | diyAudio
https://www.diyaudio.com/community/threads/audio-research-sp3a.168617/
AUDIO RESEARCH SP-3-3A 3A-1 TUBE PREAMPLIFIER PRE-AMP - eBay (item 320557811693 end time Jul-15-10 10:54:25 PDT) You can build a …
Audio Research SP-3 with MC Cartridge? | Steve Hoffman ...
https://forums.stevehoffman.tv/threads/audio-research-sp-3-with-mc-cartridge.957042/
The line stage gain in the stock SP3 induces tube rush that's easily heard over sensitive speakers like horns, Joe's mod replaces a 12AX7 in the cathode follower circuit with a 12AT7 which drops the gain to a more reasonable value and the output impedance (50 ohms) is more compatible with many SS amps and long IC runs.
Audio Research SP3-a1 - Audiogon Discussion Forum
https://forum.audiogon.com/discussions/audio-research-sp3-a1
This discussion. Message User. 9 posts. 06-10-2018 4:34pm. Edit. Delete. My SP3-a1 is a stock unit and they want around $1800.00 to rebuild the power supply., then they were going to look at the audio section.They also offer an …
Vintage preamps Part 3, Audio Research SP3 - YouTube
https://www.youtube.com/watch?v=ImDH4k5LrlM
More info on the Audio Research SP3 A1 I reviewed. https://skyfiaudio.com/products/audio-research-sp-3-a1-tube-preampThat one is now sold, but SkyFi has anot...
SP3 Update from ARC | What's Best Audio and Video Forum ...
https://www.whatsbestforum.com/threads/sp3-update-from-arc.1242/
Glad to know you're also a Maggie user. I used to match my Maggie to Audio Research tube amps too. Nowadays, I have discovered that I like Maggies driven by Spectral solid state amps. But that's just my personal preference. I have heard a very nice Maggie set-up driven by a re-tubed Audio Research amp.
A Tune-up for the Audio Research SP-4/4A ... - Conrad Hoffman
http://conradhoffman.com/SP4A_caps.htm
A Tune-up for the Audio Research SP-4/4A Preamp. Introduction. The ARC SP-4 preamp was ARCs first solid state preamp. It was controversial at the time and some say it almost destroyed the company. Opinions about the sound quality are all over the map but based on dealer comments and my listening, it wasn't exactly world class.
Audio Research Reference 3 line preamplifier - Stereophile.com
https://www.stereophile.com/tubepreamps/1206arc/index.html
Veteran audiophiles still recall with fondness the SP-3, SP-10, and SP-14 preamplifiers, and the D-79, D-150, and D-250 power amplifiers, to mention only a few of ARC's landmark components. A surprisingly large percentage of those units are still in service today, and ARC will still service every one.
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