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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 …
Audio Research SP9 preamplifier | Stereophile.com
https://www.stereophile.com/tubepreamps/739/index.html
Audio Research SP9 preamplifier. 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 SP9 Tube / Solid State Hybrid Preamp with ...
https://skyfiaudio.com/products/audio-research-sp9-tube-hybrid-preamp-with-phono-input
Audio Research SP9 Tube / Solid State Hybrid Preamp with Phono Input. $0. These ARC preamps are our best sellers. The SP series, as opposed to the LS series, features a built-in phono preamp section for convenient connection to your turntable. Legendary warm tones, mostly due to tube harmonics, is the signature for these preamps.
audio research
https://audioresearch.com/wp-content/uploads/2021/08/SP9_Manual.pdf
Using only two 6DJ8 vacuum tubes (one in the phono section and one in the high-level stage), the SP9 expresses the musicality and naturalness tube preamplifiers have been noted for, yet does so with the quickness and dynamic vigor of the best solid-state
Audio Research SP9 Review - VintageSonics
https://vintagesonics.com/reviews/amplifiers/audio-research-sp9-review/
The SP9 was a solid-state hybrid developed with minimal noise and great durability in mind, despite its early tube designs. The limited life of tubes was one of the arguments offered by solid-state aficionados in the 1980s for not running valve amplifiers, yet the SP9 could be used for up to 10,000 hours before needing replacement.
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