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Audio Research LS8 line preamplifier - Stereophile.com
https://www.stereophile.com/content/audio-research-ls8-line-preamplifier
One such product was the all-triode SP8 preamplifier from Audio Research, launched back in 1982 and priced at $1400. This classically tasteful preamplifier came equipped with a medium-sensitivity phono equalizer and the usual tape and line inputs.
Audio Research SP-8 All Tube Preamp with Phono Input ...
https://skyfiaudio.com/products/audio-research-sp-8-all-tube-preamp-with-phono-input-fully-tested
Audio Research SP-8 All Tube Preamp with Phono Input - Fully Tested $0 All tube preamp from the best era of ARC - working and sounding perfect. Some cosmetic imperfections (see photos) but very presentable overall. Click herefor a PDF copy of the SP-8 Owners Manual & Schematic Our Testing Process for Amplifiers (Tube) at SkyFi:
Audio Research SP-8 with CD - Audiogon Discussion Forum
https://forum.audiogon.com/discussions/audio-research-sp-8-with-cd
I know that SP-8 was made in the years the CD came by and at that time, Audio Research doesn't made a CD input on the SP-8. So line stage gain is high at 26 dB. I think that they start putting a CD input with the LS1 and this one has a more realistic gain of 11 dB.
Audio Research SP-8 Stereo Preamplifier Manual - HiFi Engine
https://www.hifiengine.com/manual_library/audio-research/sp-8.shtml
Specifications. Frequency response: 5Hz to 30kHz. Total harmonic distortion: 0.01%. Gain: 60dB (MM), 26dB (line) Signal to noise ratio: 66dB (MM), 86dB (line) Output: 2V (Pre out), 60V (Pre out Max) Valve complement: 4 x E83CC, 2 x 6DJ8, 1 x 12BH7A, 1 x 12AX7. Dimensions: 480 x 134 x 260mm. Weight: 10kg.
Opinions on Audio Research SP-8 II - 2-Channel Home …
https://community.klipsch.com/index.php?/topic/111870-opinions-on-audio-research-sp-8-ii/
Another benefit if I remember correctly is that the SP-8 MKII uses: (2) 12AX7 LN, (2) 12AX7, (2) 6922, (1) 12AT7, (1) 12BH7, for which the 12AX7 & 12AT7 are much easier tubes to live with and refine the sound with NOS tubes. The SP-9 would be the intermediate offering with the high end offering at the time being the SP-14.
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