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audio research
https://audioresearch.com/wp-content/uploads/2021/08/SP8_Manual.pdf
8. INTRODUCTION Congratulations on your purchase! Your SP-8 combines the highest possible musical fidelity with a new level of reliability and serviceability. With the introduction of power amplifiers such as the D-4O, D-79B, D-9O and D-12O, and the availability of a number of brands of high performance recordings, pickups and speaker systems, the need for a new and higher …
Why is the Audio Research SP8 so highly regarded?
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.
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.
ARCDB
https://www.arcdb.ws/model/SP8
Noise & hum. High level: (1) 250µV RMS maximum residual unweighted wideband noise at main output with gain control minimum (86dB below 5V RMS output) (2) More than 90dB below 1V RMS input (less than 20µV equivalent input noise). Magnetic phono: 5µV equivalent input noise, wideband RMS (-66dB reference 10mV input) (Approximately 1µV above ...
ARCDB
https://arcdb.ws/SP6/SP6.html
The SP-6F is actually an SP-8 MK II! Back in the day American Sound in Toronto could not get any SP-8's to meet customer demand due to a lack of SP-8 faceplates at the time. Some creative thinking between ARC and American Sound led to a run of 20 (or so) SP-8 MK II's with SP-6 faceplates. They called it an SP-6F.
Audio Research SP9 hum problem | diyAudio
https://www.diyaudio.com/community/threads/audio-research-sp9-hum-problem.327799/
Hello, I have an Audio Research SP9 MKII that has spontaneously developed a hum in the left channel phono stage. Schematics, etc. are here: Page not found - Audio Research The preamp still functions normally and sounds fine, except for the hum which is very noticeable.
Audio Research – High-end audio equipment
https://audioresearch.com/
Audio Research has produced some of the finest components for music reproduction; this is especially true with regard to preamplifiers. In 1973, the SP3 was hailed as the best preamplifier available, and this tradition of excellence has continued ever since.
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