Audio Research SP-6B // Vintage High Definition Tube Preamplifier

The Audio Research SP-6B isn’t just a tube preamp—it’s a golden-age relic of analog perfection, dripping in warmth, detail, and pure musicality. Built between 1979 and 1982, this thing was the must-have preamp of its era, and today, it still wipes the floor with plenty of modern gear that costs way more.

If you’re a vinyl junkie, a tube lover, or just someone who appreciates gear that actually sounds like music, the SP-6B is one of the greats.

Production

1979-82

Condition

9/10

Serial No.

10113020

Restoration

• Replaced two capacitors in power supply
• Cleaned all control contacts
• Verified all inputs and outputs
• Unit is configured for moving magnet phono cartridges
• All tubes test good

Factory Specs

Frequency response: 5Hz to 30kHz

Total harmonic distortion: 0.01%

Gain: 60dB (MM), 26dB (line)

Signal to noise ratio: 66dB (MM), 90dB (line)

Output: 2V (Pre out), 60V (Pre out Max)

Valve complement: 6 x ECC83

Dimensions: 480 x 134 x 260mm / 18.9" x 5.3" x 10.2"

Weight: 22lbs

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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Stock No.

8952895111389