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Audio Research SP4 Preamplifiers user reviews : 5 out of 5 ...
http://www.audioreview.com/product/amplification/preamplifiers/audio-research/sp4.html
My SP-4 was built nearly 15 years ago and performs as if it came out of the box yesterday. It produces a soundfield that will drop your jaw.
Audio Research Sp-4 Pre Amp | Burke's Gear Shop | Reverb
https://reverb.com/item/40676725-audio-research-sp-4-pre-amp
Audio Research Audio Research Sp-4 Pre Amp Used – Non Functioning $550 + $80 Shipping Listing Sold Make an Offer Shipped From Burke's Gear Shop Arlington Heights, IL, United States (10) Sales 10+ Joined Reverb 2021 Quick Shipper Message Seller Payment & …
A Tune-up for the Audio Research SP-4/4A Preamp
http://conradhoffman.com/SP4A_caps.htm
The preamp was built on a single sided PCB with no mask or legend. holes. Without plated through holes to provide some strength, it's very easy to lift pads and traces if you use too much heat, or Tread gently. leads and the strength (I use that term loosly) of the traces for stability. In spite of the solid chassis and the very
Audio Research SP-4 Stereo Pre Amplifier Manual - HiFi Engine
https://www.hifiengine.com/manual_library/audio-research/sp-4.shtml
Description The SP-4 preamplifier was designed around the Analog Module which acts as a 'super tube' because it takes the best qualities we see in the vacuum tube much closer to the theoretical ideal. The SP-4 surpasses our vacuum tube preamplifier in the most important areas.
Anybody have listening impressions of the Audio Research ...
https://audiokarma.org/forums/index.php?threads/anybody-have-listening-impressions-of-the-audio-research-sp-4-preamp.493009/
If you make it really nice that could be an upgrade folks might be interested in if they still have an SP-4. I think it would be cool to have a nice sounding slim line ARC preamp full-featured, grounded outlets and three phono inputs. Nice unit, too bad the sound quality is early transistor. Keep us posted. Blue Shadow, Jan 8, 2013 #6
Audio Research SP-4 Preamp.and match Audio Research …
https://www.youtube.com/watch?v=w3dN6EpE5GM
Both preamplifier ARC SP-4 and D-100 are in MINT condition! Play music amazing and look like NEW! Playing with Tannoy System 12 DMT.
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