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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/
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 SP-11
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 preamplifier Page 2 | …
https://www.stereophile.com/content/audio-research-sp-11-preamplifier-page-2
Audio Research SP-11 preamplifier Page 2. The level-change increments of the volume controls are quite large at reduced settings, becoming increasingly gradual as you turn them up until, near full-up, the increments drop to about ½dB per step. For this reason, at least one control (preferably the "Level") should be operated most of the time near its full-up position, the other turned down …
Audio Research SP-11 MK2 ... - Audiogon Discussion Forum
https://forum.audiogon.com/discussions/audio-research-sp-11-mk2
The SP-11 held up very well against his Ref 3. I use the SP-11 quite extensively now, but I do prefer my SP-10 mki for analog playback (60% of the time) and the SP-11 for digital playback (remaining 40%). But then I get my jollies moving power sources and front ends around every 3-4 months (not!).
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