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Audio Research – High-end audio equipment
https://audioresearch.com/
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.
Audio Research SP-11 preamplifier | Stereophile.com
https://www.stereophile.com/tubepreamps/898/index.html
The SP-11 is a design departure for Audio Research. Like the Berning TF-10, it is neither a tube nor a solid-state preamp; rather, it is both at once. Each active stage is a combination of a triode tube and a FET—devices whose dynamic transfer (input/output) characteristics just happen to be very close to complementary.
Audio Research SP-11 preamplifier – Old School | TONEAudio ...
https://www.tonepublications.com/old-school/audio-research-sp-11-preamplifier/
Audio Research SP-11 preamplifier. Residing at the top of the heap for at least three decades, Audio Research Corporation preamplifiers are almost default purchases for certain types of tube lovers. ARC preamps are adventurous in their technology yet conservative in execution, so they appeal to audiophiles who like to minimize risks.
Audio Research SP20 preamplifier | Stereophile.com
https://www.stereophile.com/content/audio-research-sp20-preamplifier
I asked Audio Research's head of marketing, Dave Gordon, how he felt the SP20's phono stage compares with ARC's separate phono and line-stage models. He said that he felt the SP20's phono stage provides the same amount of gain as and is comparable in sound quality to that of the PH8 ($7000), but is a different circuit design.
Audio Research SP-10 preamplifier | Stereophile.com
https://www.stereophile.com/tubepreamps/audio_research_sp-10_preamplifier/index.html
This brings me to the units under review: the Conrad-Johnson H-la head amp and Premier Three preamp combination and the Audio Research SP-10 preamp and D-160B amplifier. Regardless of "who's on first," these two components make a fascinating contrast; they also provide an insight into each manufacturer's design philosophy.
Audio Research SP-3 preamplifier | Stereophile.com
https://www.stereophile.com/content/audio-research-sp-3-preamplifier
Preview, from Vol.3 No.3: We thought Audio Research's previous-model SP-2C (footnote 1) was excellent, but this is even better—the closest thing available, in fact, to the ideal straight wire with gain. Our sample had a minor glitch—there was a slight "plop" if you rotated the tone controls rapidly—but we could find nothing else about it to criticize.
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