Name: Vintage / Audio Research SP-4 // Stereo Preamplifier
Brand: Audio Research
SKU: 8799853347037
Price: 1399.00 USD
Availability: OutOfStock

The Audio Research SP-4 is a vintage solid-state preamplifier that represented a departure for Audio Research in the late 1970s, as it was one of their first non-tube designs. Known primarily for their tube gear, Audio Research took a chance by venturing into solid-state territory with the SP-4. While it may not hold the same legendary status as their tube-based designs, the SP-4 was still a significant player during its time, offering the company's signature focus on sound quality and build precision.

Production

1976-78

Condition

9.5/10

Serial No.

17002004

Orig. MSRP

$895

Restoration

Replaced shorted capacitors C46, C47, C48, C49
Cleaned control contacts
Tested all inputs
This unit does not have the Head Amp input option

Factory Specs

Frequency response: 5Hz to 100kHz

Total harmonic distortion: 0.005%

Gain: 36dB (MM), 24dB (line)

Signal to noise ratio: 84dB (MM), 95dB (line)

Output: 2V (Pre out), 10V (Pre out Max)

Dimensions: 480 x 210 x 89mm

Weight: 5.5kg

The History of Audio Research

Audio Research Corporation, affectionately known to fans as ARC, was founded by William Z. Johnson, who began designing custom audio electronics in the early 1950’s and who also operated a specialty audio retail store until the mid-1960’s. Johnson’s efforts almost single-handedly revived vacuum-tube designs at a time...
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Liner Notes

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 tube enthusiast.

Stock No.