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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 – SkyFi Audio. All tube preamp from the best era of ARC - working and sounding perfect. Some cosmetic imperfections (see photos) but very presentable overall. Click …
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.
SP8 Manual Schem - ARCDB
https://www.arcdb.ws/Database/SP8/ARC_SP8_manual.pdf
Your SP-8 combines the highest possible musical fidel i ty with a new level of reliability and serviceability. With the introduction of power amplifiers such as the D-40, D-79B, D-90 and D-120, and the availability of a number of brands of high performance recordings, pickups and speaker systems, the need for a new and higher level of preamplifier for the best systems has occurred.
Audiogon Discussion Forum
https://forum.audiogon.com/discussions/why-is-the-audio-research-sp8-so-highly-regarded
I had an SP-8 and then an SP-10 before getting an SP-11. I sold the SP-11 to a friend who still uses it and it still sounds great. These are all fine preamplifiers. They come from the era when LP was the dominant source, so they all have excellent phono stages.
Audio Research SP 8 MKII Preamplifiers user reviews : 5 ...
http://www.audioreview.com/product/amplification/preamplifiers/audio-research/sp-8-mkii.html
Now, with the sp-8 in place, that thing is running 8-10 hours a day. When either of us get home, the first thing we do is turn the power on to warm up the preamp. I could go into detail regarding background, soundstage, harmonics, resolution. It's got it all in spades. The funny thing is, my other preamps did too.
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