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ARCDB
https://www.arcdb.ws/model/SP8
The Audio Research Database (ARCDB) provides information about past and present products from ARC (Audio Research Corporation) Home. Literature. Museum. Patents. SP-8. Description [ No data found ] Revisions. SP-8 Rev 1. SP-8 Rev 2. SP-8 Rev 3. SP-8 Rev 4 (1983) SP-8 Rev 5 (1983) SP-8 Rev 6. SP-8 Rev 7 (1985) ...
Why is the Audio Research SP8 so highly regarded?
https://forum.audiogon.com/discussions/why-is-the-audio-research-sp8-so-highly-regarded
Why is the Audio Research SP8 so highly regarded? I have a MRk II SP8 that was modified by Steve Huntley when he was at Great Northern Sound. I don't use the phono section anymore as I have acquired a ARC PH7 so the SP8 is now simply used as a line stage preamp.
audio upgrade, audio modification, mods, hifi, krell ...
https://mapoulin.wixsite.com/audiobymartin/audio-upgrade
Audio Research SP8 Complete Mundorf capacitor upgrade. Local bypass added (Mundorf on the high voltage) New CRC heater supply with better regulator. Wiring upgraded. Augmented linestage feedback to reduce gain. As a result, the output impedance …
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.
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.
Opinions on Audio Research SP-8 II - 2-Channel Home Audio ...
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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