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About the Valve Amplification Company (VAC) Sigma 170i
The VAC Sigma 170i is a hand-built integrated amplifier from Valve Amplification Company (VAC) that combines pure vacuum-tube circuitry with the company’s patented iQ Continuous Intelligent Automatic Bias System. It is rated at 85 watts per channel and is designed to deliver tube sound with added convenience, including remote control, cinema bypass, and optional MM/MC phono and balanced inputs. Review and manufacturer sources describe it as a compact but capable high-end integrated amplifier, with a base price around $10,000 and optional extras that raise the total cost.
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