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Audio Research SP11 MKII Preamplifiers user reviews : 5 ...
http://www.audioreview.com/product/amplification/preamplifiers/audio-research/sp11-mkii.html
This is one of the all time king of the hill preamp. If you're willing to spend over $10,000 for the ARC reference two then you should really listen to this SP-11 MK II. Many listeners don't realize the potential of this preamp with different mix of the 6922 tubes ( NOS ) and the different flavor of amps ( solid state or tube .)
Audio Research SP-11 MK2 ... - Audiogon Discussion Forum
https://forum.audiogon.com/discussions/audio-research-sp-11-mk2
Wow! that was really interesting. Before I purchased my REF 3, I retubed my SP-11 MKII with AR supplied tubes and I have to tell you I with several of my friends over about a week compared my borrowed REF 3 (dealer demo) with the retubed SP11 MKII and several other borrowed pre-amps from the dealer, including other AR pre-amps and the re-tubed SP11 MK II …
ARCDB
https://arcdb.ws/SP11/SP11.html
sp-11 mkii The Audio Research Database - ARCDB - is a tribute to Audio Research Corporation (ARC) for their tremendous contributions to the world of high end audio. About
Audio Research SP-11 mkII | Tube | Audiogon
https://www.audiogon.com/listings/lisaei1d-audio-research-sp-11-mkii-tube
Audio Research SP-11 mkII | Tube | Santa Ana, California 92703 | Audiogon. Audio Research SP-11 mkII used My uncle got from local owner over 20 year ago !! Unit have very little used !! All circuits board still look clean white !! Not discoloration like the one with many hours few scratches can be find... 3950.00. Home. Marketplace. Preamplifiers.
Audio Research SP-11 MkII - Stunning: Nearly Time-Capsule ...
https://www.audioasylumtrader.com/ca/listing/Preamplifier-Tube/Audio-Research/SP-11-MkII/Stunning-Nearly-Time-Capsule-Cosmetic-amp-Working-Condition/210877
Within its two chassis, the SP-11 contains a robust, triple regulated(!) power supply worthy of any medium size amp, a linestage with 200kHz bandwidth built around William Johnson's patented hybrid gain block (consisting of a triode as the load for a unity gain source-follower P channel JFET in a cascode-like circuit), and a hybrid four stage phono section with up to 76dB of gain, …
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