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Audio Research SP-11 preamplifier | Stereophile.com
https://www.stereophile.com/tubepreamps/898/index.html#:~:text=The%20SP-11%20is%20a%20design%20departure%20for%20Audio,just%20happen%20to%20be%20very%20close%20to%20complementary.
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.
SP11 Manual - audioresearch.com
https://audioresearch.com/wp-content/uploads/2021/08/SP11_Manual.pdf
Audio Research made the fulfillment of this need a practical possibility. The culmination of this effort is the SPII Preamplifier, a product of such technical refinement that it truly represents a breakthrough in preamplifier performance -- ... SP11_Manual ...
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.
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