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Audio Research SP-9 Preamplifier – Old School | TONEAudio ...
https://www.tonepublications.com/old-school/audio-research-sp-9-preamplifier/
The Audio Research SP-9 redefined the term “bullet-proof.” While previous all-tube models often encountered noise, channel imbalance, hiss and distortion, this new hybrid design was dead quiet, linear, and most of all, musical. The SP-9 hit retailer’s shelves in 1987 with an MSRP of $1,695 and offered tremendous value.
Audio Research SP9 preamplifier | Stereophile.com
https://www.stereophile.com/tubepreamps/739/index.html
Audio Research SP9 preamplifier. J. Gordon Holt, Various | Nov 29, 1995 | First Published: Nov 29, 1987. Following the introduction of their very expensive, tube/FET hybrid SP11 preamplifier, there were rumors that Audio Research was working on a hybrid tube/transistor preamplifier targeted to cost less than $2000.
Audio Research SP-9 | Tube | Audiogon
https://www.audiogon.com/listings/lis9i68j-audio-research-sp-9-tube
Audio Research SP9 preamplifier J. Gordon Holt, Various | Nov 29, 1995 | First Published: Nov 29, 1987 Following the introduction of their very expensive, tube/FET hybrid SP11 preamplifier, there were rumors that Audio Research was working on a hybrid tube/transistor preamplifier targeted to cost less than $2000. The rumors were confirmed when ARC showed a black-and-white photo …
Audio Research SP9 MKII Preamplifiers user reviews : 4.6 ...
http://www.audioreview.com/product/amplification/preamplifiers/audio-research/sp9-mkii.html
The preamplifier has kept up with the continuing improvemenst in the rest of the system. The SP 9 mk II is a sensible choice, especially given the low prices on the 2nd (or 3rd) hand market. NAD 1020, Copland 301, Music Reference RM 5, ARC LS2B, ARC LS3B, QUAD 405-2, Futtermann OTL amplifier, ARC VT 100 mkII.
Audio Research SP-9 MKII // Solid-State Tube Hybrid | …
https://reverb.com/item/49275907-audio-research-sp-9-mkii-solid-state-tube-hybrid-preamplifier-orig-box
The ARC SP-9 has long been one of the most desirable, and for good reason. Turntable ready, this preamp delivers surgically clean signal through ARC's hybrid FET/Tube audio circuit and solid-state power supply. And you'd never know it's over 30. We've run a full battery of tests, and everything under the sun is in tune.
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