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A Tune-up for the Audio Research SP-4/4A ... - Conrad Hoffman
http://conradhoffman.com/SP4A_caps.htm
The regulated supply voltages in the SP-4A are ±20 VDC so any rating above that is acceptable. main power supply caps should be rated at 40 volts or higher. The RIAA Amplifier If you play LPs the RIAA amplifier section is the heart and soul of a preamp. of course, but if the RIAA section isn't first rate nothing else matters.
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. It has increased musical depth and definition with a smoothness that will satisfy any vacuum …
Audio Research SP-4A Pre Amp Harman Kardon Citation …
https://www.youtube.com/watch?v=LqoPu8tP8Aw
Audio Research SP-4A Pre Amp Harman Kardon Citation Twelve Power Amp Audition
Audio Research SP 4 | Solid state | Audiogon
https://www.audiogon.com/listings/lis9e745-audio-research-sp-4-solid-state
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 purchased this from an engineer at Audio Research who upgraded many of the coupling caps with unbranded TRT (Wonder) Stealth Caps which are used in ARC reference series equipment.
Audio Research SP4 Preamplifiers user reviews : 5 out of 5 ...
http://www.audioreview.com/product/amplification/preamplifiers/audio-research/sp4.html
That said, the SP4 sounds amazingly good. It is more forward than the SP6E, and has a slightly warmer signature. soundstage/imaging is superb, but not quite at the same level as the SP6E (which is one of the very best preamps ever made IMHO). In comparison to the Carver C-4000t, the SP4 is clearly more musical, and just better overall.
VINTAGE AUDIO RESEARCH PREAMP SP- 4A STEREO …
https://www.ebay.com/itm/334110068574
VINTAGE AUDIO RESEARCH PREAMP SP- 4A STEREO High Definition PREAMPLIFIER | eBay <body><p>Selling VINTAGE AUDIO RESEARCH PREAMP SP- 4A STEREO High Definition PREAMPLIFIER. </p><p>Working Condition. Fully Tested.</p><p>Thank you for looking and Have a good day.</p><p>Happy Bidding!!!</p></body> Skip to main content Shop …
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