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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 – SkyFi Audio. 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 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
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.
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.
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 and tube rolling | Steve Hoffman …
https://forums.stevehoffman.tv/threads/audio-research-sp9-and-tube-rolling.821604/
The SP-9 uses 6DJ8 tubes. Many years ago when I had one, I tried several types and settled on an Amperex Bugle Boy as the best sounding. The tube most certainly makes a difference in sound quality and it’s worth the trouble and expense to …
Audio Research SP9 preamplifier Guy Lemcoe SP9 Mk.II 12/90 ...
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.
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 Amps - the tube store
https://www.thetubestore.com/shop-by-amp/home-audio-tube-packages/audio-research-amps
These tubes will provide your Audio Research amp with great sound for a reasonable price. For those who need to re-tube for less, our Upgrade Packages consist of excellent sounding amplifier tubes for lower cost. If only the "best" will do for your beloved tube amp, we have Ultimate Packages that include NOS made vacuum tubes whenever possible. ...
Audio Research – High-end audio equipment
https://audioresearch.com/
Why Audio Research Uses Vacuum Tubes To Achieve the Highest Sonic Purity Audio Research: What Makes Perfection, Perfection. Much more than a mere carriage-trade brand name, the Audio Research marque has come to represent stellar performance and lasting value for music lovers and audio enthusiasts everywhere.
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