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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/
In October 1985, ARC unveiled the SP-11 at the price of $4,900, which signified another evolutionary step from its all-tube forebears. (Note that the price is equivalent to $10,600 in today’s money, pegging it not far off the price of a REF 5 SE.)
Audio Research SP-11 - AudioShark
https://www.audioshark.org/audio-research-corporation-arc-36/audio-research-sp-11-a-14067.html
The SP-11 in my opinion equals the Calypso's sound quality AND affords the user perhaps the most flexible gain control in a preamp that's ever been designed. Offering an infinitely adjustable gain level to feed a power amp or pair of mono amps is a hard thing to live without once you've had a chance to use it.
Audio Research SP-11 mkII | Tube | Audiogon
https://www.audiogon.com/listings/lisaei1d-audio-research-sp-11-mkii-tube
Audio Research SP-11 mkII for sale. My uncle got from local owner over 20 year ago !! Unit have very little used !! All circuits board still look clean white !! Not discoloration like the one with many hours few scratches can be find...
Audio Research SP-11 preamplifier
https://www.audioshark.org/industry-news-153/audio-research-sp-11-preamplifier-4003.html
In October 1985, ARC unveiled the SP-11 at the price of $4,900, which signified another evolutionary step from its all-tube forebears.
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