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audio research
https://audioresearch.com/wp-content/uploads/2021/08/SP4_Manual.pdf
ACCESSORIES 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. ,
A Tune-up for the Audio Research SP-4/4A Preamp
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.
ARCDB
https://www.arcdb.ws/SP4/SP4.html
sp-4 The Audio Research Database - ARCDB - is a tribute to Audio Research Corporation (ARC) for their tremendous contributions to the world of high end audio. About
Audio Research Sp-4 Pre Amp | Burke's Gear Shop | Reverb
https://reverb.com/item/40676725-audio-research-sp-4-pre-amp
Audio Research Sp-4 Pre Amp. Used – Non Functioning. $550 + $80 Shipping. Listing Sold. Make an Offer. Watch. Shipped From. Burke's Gear Shop. Arlington Heights, IL, United States (11) Sales. 10+ Joined Reverb. 2021. Quick Shipper. Message Seller. Payment & Returns. About This Listing.
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/
I'm interested in your project with the SP. 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 ...
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.
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