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Audio Research SP9 MKII - Audiogon Discussion Forum
https://forum.audiogon.com/discussions/audio-research-sp9-mkii
Audio Research SP9 MKII. Hello Found two ARC SP9's for sale. The first is the MKII with 6h23p-eb Russian 6922 tubes the second was a SP9 that was sent back to ARC and upgraded to the MKII, it has 2-6922 Sovtek Tubes installed .
Audio Research SP9 and tube rolling | Steve Hoffman …
https://forums.stevehoffman.tv/threads/audio-research-sp9-and-tube-rolling.821604/
Salectric Forum Resident Location: Maryland 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 find one that matches your tastes.
Audio Research SP9 Review - VintageSonics
https://vintagesonics.com/reviews/amplifiers/audio-research-sp9-review/
The Audio Research SP9 was a complicated, no-expense-spared design that had been ‘shrunk in the wash’ to make it more inexpensive. When it was first released, it was still quite pricey, but you didn’t have to be Richard Gere to afford one. Here was a taste of one of the finest aspects of hi-fi living, brought within audiophiles’ reach.
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. 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 sp6/8--better than sp9? | diyAudio
https://www.diyaudio.com/community/threads/audio-research-sp6-8-better-than-sp9.7537/
The SP8 was about the same as the last iteration of the SP6 (I believe it was the "E" version), with an op amp based low impedance power supply and a few other minor revisions (note the SP8 uses a tube rectifier). I have never auditioned an SP9, however the 6 and 8 are excellent preamps.
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