Unison Research S6 Black Edition

Unison Research

S6 Black Edition

$7,499 MSRP

The Unison Research S6 Black Edition is a 40 W-per-channel valve amplifier specified for 6 Ω loads, using two ECC83 Gold Lion signal valves and three parallel KT77 Gold Lion output valves per channel. Its output stage operates in pure Class A ultralinear configuration with a 20% tap, adjustable bias for each power valve, and Cathode Capacitor Less technology without autobias. Connectivity includes four line-level RCA inputs, USB, S/PDIF, Toslink, and a stereo RCA subwoofer output; bandwidth is rated at 15 Hz–30 kHz.

MSRP

$7,499

Used market · Excellent

$4,874est.

-35% vs MSRP
as of Sep 24, 2026

MSRP to used market

Price history will fill in as sales are recorded.

Specifications

Published price
7499 USD
Power into 8
38 W Ω

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