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Audio Research SP9 Review - VintageSonics
https://vintagesonics.com/reviews/amplifiers/audio-research-sp9-review/
Despite being the company’s best-selling and possibly most-loved legacy product, few audiophiles in the United Kingdom paid attention to the launch of the Audio Research SP9 in 1987. It was a powerful and technically creative preamplifier that appealed to a British audience that was enamored with other trends at the time.
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. The rumors were confirmed when ARC showed a black-and-white photo of the SP9 at the 1987 Winter CES.
Audio Research SP-9 | Tube | Audiogon
https://www.audiogon.com/listings/lis9i68j-audio-research-sp-9-tube
By critical consensus, the SP11 is the best-sounding tube preamp Audio Research has ever made; certainly it has few, if any, peers. This is not that surprising, given that ARC has never made a less-than-excellent tube product, and that the hybrid cascode design should, in theory, be better than one with tubes alone.
What tubes to use for Audio Research SP-9 MkIII?
https://forum.audiogon.com/discussions/what-tubes-to-use-for-audio-research-sp-9-mkiii
527 posts. 04-13-2002 1:19pm. Edit. Delete. I have the MKIII and NOS tubes are the way to go. The tube near the center of the circuit board is for your cd, tuner etc. The other tube is for the phono stage, so if you don't have a turntable you'll need just one tube. No, $130 for two Siemens is a bit high.
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 designs.
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