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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 comparison to the Carver C-4000t, the SP4 is clearly more musical, and just better overall. It must be said that the C-4000t can't be faulted where detail is concerned. But it is far less musically involving than the SP4. The SP4 is so good all round, and its strongest point as far as I'm concerned, is its musically engaging quality.
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
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. It has increased musical depth and definition with a smoothness that will satisfy any vacuum …
audio research
https://audioresearch.com/wp-content/uploads/2021/08/SP4_Manual.pdf
The SP -4 stereo preamplifier was conceived and designed for audio perfectionists. 11Analog Module11. circuitry provides unequaled performance under actual dynamic listening conditions. In addition to the normal complement of features, the SP-4 has: provisions for an optional (*) low level head amp, alternate compensation of magnetic (mag 2) phono section, 1600 watt relay …
SP4 Manual Schem - ARCDB
https://www.arcdb.ws/Database/SP4/ARC_SP4_SP4A_manual.pdf
SP4 Manual Schem. audio research HIGH agoo ANNAPOLIS LANE NORTH / PLYMOUTH, MINNESOTA 55447-5447 / PHONE: 768-577-9700 FAX 76a-577-oaaa 94, SP4A MANUAL 94, SP4A SCHEMATIC AND PARTS LIST August 1977. INTRODUCTION Congratulations on your purchase. The SP-4 stereo preampl i fier was "Analog Module" conceived and designed for audio …
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.
ARCDB
https://www.arcdb.ws/model/SP4
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. TYPE. Solid-state stereo preamplifier with phono stage. INTRODUCED. 1976. OPTIONS-MSRP (US NEW RETAIL) ...
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