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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
That said, the SP4 sounds amazingly good. It is more forward than the SP6E, and has a slightly warmer signature. soundstage/imaging is superb, but not quite at the same level as the SP6E (which is one of the very best preamps ever made IMHO). In comparison to the Carver C-4000t, the SP4 is clearly more musical, and just better overall.
Audio Research SP-4 Stereo Pre Amplifier Manual - HiFi Engine
https://www.hifiengine.com/manual_library/audio-research/sp-4.shtml
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. It has increased musical depth and definition with a smoothness that will satisfy any vacuum tube enthusiast.
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 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 SP 4 | Solid state | Audiogon
https://www.audiogon.com/listings/lis9e745-audio-research-sp-4-solid-state
This is a classic solid state Audio Research SP4 A pre-amplifier with the rare MCP-1 active head amp for MC cartridges and rare ARC original wooden case. This is a very clean and complete unit. I purchased this from an engineer at Audio Research who upgraded many of the coupling caps with unbranded TRT (Wonder) Stealth Caps which are used in ARC reference series equipment.
filter and tone toggles Audio Research SP-4 Preamp
https://forum.audiogon.com/discussions/filter-and-tone-toggles-audio-research-sp-4-preamp
filter and tone toggles Audio Research SP-4 Preamp. I would like to know the funciton of the toggle switches: first one: up position = filter, down position = out, second one: up position = tone, down position = out. When the switch for tone is up the tone controls are active. When the switch is down the tone controls are not activate.
ARCDB
https://www.arcdb.ws/SP4/SP4.html
The Audio Research Database (ARCDB) provides information about past and present products from ARC (Audio Research Corporation) Home. Literature. Museum. Patents. SP-4. Description [ No data found ] Revisions. SP-4A (1978) Details. Solid-state stereo preamplifier with phono stage. INTRODUCED. 1976. OPTIONS-MSRP (US NEW RETAIL) ...
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 – High-end audio equipment
https://audioresearch.com/
Preamplifiers. Audio Research has produced some of the finest components for music reproduction; this is especially true with regard to preamplifiers. In 1973, the SP3 was hailed as the best preamplifier available, and this tradition of excellence has continued ever since. The Reference Series from Audio Research was first introduced in 1995 ...
Audio Research SP14 preamplifier - Stereophile.com
https://www.stereophile.com/content/audio-research-sp14-preamplifier
Audio Research SP14 preamplifier. The name "Audio Research" will be familiar to many readers of this magazine. It belongs on the list of that select group of manufacturers who continue to offer the audiophile and music lover equipment which enables him or her to truly enjoy the muse. With equipment of this caliber, one is no longer caught up in the anxiety-inducing …
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