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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
What can I add that others have not said of the fine SP series such as SP-4 and SP-7. The first ARC preamp I heard was in 1973, it was an SP-3 and it made "Goodbye Yellow Brick Road" sound infinitely better than it sounded with my Sansui receiver. Detailed, sweet, warm, punchy and subterranean bass. Sonic bliss that brings a big smile to your face.
A Tune-up for the Audio Research SP-4/4A Preamp
http://conradhoffman.com/SP4A_caps.htm
A Tune-up for the Audio Research SP-4/4A Preamp. Introduction. The ARC SP-4 preamp was ARCs first solid state preamp. It was controversial at the time and some say it almost destroyed the company. Opinions about the sound quality are all over the map but based on dealer comments and my listening, it wasn't exactly world class.
Audio Research SP-4 Stereo Pre Amplifier Manual | HiFi Engine
https://www.hifiengine.com/manual_library/audio-research/sp-4.shtml
Audio Research SP-4. Stereo Pre Amplifier (1977) add a review. 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.
audio research
https://audioresearch.com/wp-content/uploads/2021/08/SP4_Manual.pdf
The following optional (*) accessories for your SP -4 preamplifier will be made available through your Audio Research dealer: * Walnut veneered oiled finish cabinet * Programable low level head amp electronics LINE VOLTAGE CONVERSION This equipment can be operated from either 120 Volts or 240 Volts A.C. , 50/60 Hz.
Audio Research SP 4 | Solid state | Audiogon
https://www.audiogon.com/listings/lis9e745-audio-research-sp-4-solid-state
Audio Research SP-4a for sale. This is a classic solid state Audio Research SP4 A pre-amplifier with the rare MCP-1 active head amp for MC cartridges and rare ARC original wooden case. This is a very clean and complete unit.I pu...
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