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Audio Research SP-11 preamplifier | Stereophile.com
https://www.stereophile.com/tubepreamps/898/index.html
The SP-11 is a design departure for Audio Research. Like the Berning TF-10, it is neither a tube nor a solid-state preamp; rather, it is both at once. Each active stage is a combination of a triode tube and a FET—devices whose dynamic transfer (input/output) characteristics just happen to be very close to complementary.
Audio Research SP-11 preamplifier – Old School | TONEAudio ...
https://www.tonepublications.com/old-school/audio-research-sp-11-preamplifier/
Audio Research SP-11 preamplifier Residing at the top of the heap for at least three decades, Audio Research Corporation preamplifiers are almost default purchases for certain types of tube lovers. ARC preamps are adventurous in their technology yet conservative in execution, so they appeal to audiophiles who like to minimize risks.
Audio Research SP11 MKII Preamplifiers user reviews : 5 ...
http://www.audioreview.com/product/amplification/preamplifiers/audio-research/sp11-mkii.html
The SP-11 accepts 4 line-level inputs as well as one phono source. Six 6922 tubes are what you need to get this baby glowing and singing. The power supply box is of similar size to the control unit, but with only 2 toggle switiches and no knobs.
Audio Research SP-11 for sale.
https://audioscope.net/audio-research-sp11-p-3623.html
Audio Research SP-11 Hybrid Tube Preamplifier in mint condition, Here some information from Alex Megann. For the complete - extremly interesting - (technical) The SP-11 is one of the most complex and sophisticated preamplifiers ever released, built in two full-size rack-mount boxes with triple-regulated power supplies and three or four active ...
The Audio Research SP-11 - soundmovements.co.uk
http://soundmovements.co.uk/diyaudio/SP11.html
The SP-11 is one of the most complex and sophisticated preamplifiers ever released, built in two full-size rack-mount boxes with triple-regulated power supplies and three or four active devices (a 6DJ8 triode, a power MOSFET and one or two JFETs) in each amplifying stage. It appeared 1985, at the mid-point of Audio Research's experiments with hybrid circuit topologies, sitting …
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