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Audio Research SP4 Preamplifiers user reviews : 5 out of 5 ...
http://www.audioreview.com/product/amplification/preamplifiers/audio-research/sp4.html
In this regard, especially when compared with contemporary preamps, the SP4 demonstrates ARC's obsessive attention to detail and quality. Although not as big as either the SP6E or C4000t, it is very heavy. Although I'm fond of my C-4000t, the build quality of the SP4 leaves it in the dust.
A Tune-up for the Audio Research SP-4/4A Preamp
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 SP-4 Stereo Pre Amplifier Manual - HiFi Engine
https://www.hifiengine.com/manual_library/audio-research/sp-4.shtml
Audio Research SP-4 Stereo Pre Amplifier (1977) add a review Description The SP-4 preamplifier was designed around the Analog Module which acts as a 'super tube' because it takes the best qualities we see in the vacuum tube much closer to the theoretical ideal. The SP-4 surpasses our vacuum tube preamplifier in the most important areas.
Audio Research Sp-4 Pre Amp | Burke's Gear Shop | Reverb
https://reverb.com/item/40676725-audio-research-sp-4-pre-amp
Haven't had a chance to use in a long time so don't know how it runs so it is marked as non functioning. FREQUENCY RESPONSE Head amp (optional): 5 Hz to 100 kHz (-3 dB). Magnetic phono: +/- 0.5 dB of RIAA, 20 Hz to 20 kHz. High level: 1 Hz to 100 kHz (-3 dB) DISTORTION (THD) Harmonic distortion:...
AUDIO-RESEARCH SP4 SP4A PREAMPLIFIER Service Manual ...
https://elektrotanya.com/audio-research_sp4_sp4a_preamplifier.pdf/download.html
SP-4 SP4 SP4A SP AUDIO RESEARCH; If you have any question about repairing write your question to the Message board. For this no need registration. Please take a look at the below related repair forum topics. May be help you to repair.
Audio Research SP-4 Preamp.and match Audio Research …
https://www.youtube.com/watch?v=w3dN6EpE5GM
Both preamplifier ARC SP-4 and D-100 are in MINT condition! Play music amazing and look like NEW! Playing with Tannoy System 12 DMT.
Problem with a CrossOver Distortion on Audio Research SP-4 ...
https://www.diyaudio.com/community/threads/problem-with-a-crossover-distortion-on-audio-research-sp-4.380250/
I encountered the CrossOver Distortions at Audio Research Preamp SP-4. See attached picture。 The SP-4 Preamp is using Audio Research Analog Modules。 Need help to resolve the mentioned problem。 Thanks, Peter.
Audio Research SP-4 Preamp For Sale - Canuck Audio Mart
https://www.canuckaudiomart.com/details/649805369-audio-research-sp-4-preamp/
Audio Research SP-4 Preamp - $800. This Audio Research preamplifier is in good working condition. The balance knock got light scratches and marks . This is a classic full-function preamplifier from Audio Research. This great preamp has bass and treble controls, but also has a tone defeat switch for the audio purist.
Audio Research Corporation SP-4 PREAMP - Canuck Audio Mart
https://www.canuckaudiomart.com/products/5359-sp-4-preamp/
Welcome to CanuckAudioMart, a classifieds site for used audio and hifi. Postings are free for hobbyists. Register today and start selling/buying audio gear! Home > Brands > Audio Research Corporation > SP-4 PREAMP.
Audio Research SP-11 preamplifier | Stereophile.com
https://www.stereophile.com/tubepreamps/898/index.html
TAS 's enthusiasm for this kind of sound was soon echoed by Stereophile, and suddenly ARC started getting the recognition it should have had all along. The honeymoon lasted about two years. Presumably under pressure from his dealers to "come into the 20th century," Bill introduced two solid-state products: the SP-4 preamp and D-100 power amplifier.
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