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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 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
https://audioresearch.com/wp-content/uploads/2021/08/SP9_Manual.pdf
The SP9 Hybrid Stereo Preamplifier represents a continuation of the electronic design ''philosophy'' first embodied in the Audio Research SPll. The SP9 is not a ''stripped-down'' version of the SPll, but rather represents an adaptation of some of the SPll 's advanced
Audio Research SP9 Review - VintageSonics
https://vintagesonics.com/reviews/amplifiers/audio-research-sp9-review/
The SP9 is a fantastic do-it-all preamplifier that’s beautifully crafted, easy to use and own, and just about reasonable. Audio Research Corporation has created a great many pre and power amplifiers over the years, but the SP9 stands out as a great do-it …
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 preamplifier Guy Lemcoe SP9 Mk.II …
https://www.stereophile.com/content/audio-research-sp9-preamplifier-guy-lemcoe-sp9-mkii-1290
The hybrid SP9 Mk.II uses two 6DJ8 tubes, one in the phono stage and one in the line section, each ringed with tube dampers, like the solitary 6DJ8 in the ARC SP14. The SP9 Mk.II is a revision of the original SP9 introduced in the Summer of 1987, embodying what Audio Research calls a group of 14 different improvements. J.
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