Signature 200 iQ

About the Signature 200 iQ

The VAC Signature 200 iQ is a high-end tube power amplifier designed and manufactured in the United States that combines classic tube warmth with precise, authoritative control. It operates as either a 100-watt stereo amplifier or a 200-watt monoblock configuration via toggle switch. The amplifier features VAC's exclusive patented iQ Continuous Automatic Bias System, which automatically monitors and adjusts each output tube's bias in real-time, eliminating manual biasing, reducing distortion, and protecting the amplifier while indicating when tubes need replacement. The design employs Class A1 triode input and driver stages with direct coupling, low feedback (6 dB), and transformer-coupled output. It offers switchable fully balanced or single-ended inputs and can accommodate speaker impedances from 1 to 8 ohms. The amplifier has earned critical acclaim, including a Most Wanted Components Award, for its combination of vivid detail, expansive soundstage, deep controlled bass, and lush musical presentation that rivals reference-level solid-state amplifiers while maintaining tube character.