VAC Sigma 170i Integrated Amplifier

The iQ system automatically monitors and adjusts the bias of the output tubes in real-time. This ensures the tubes always operate at their optimal performance level, which results in better sound quality and significantly extends the lifespan of your vacuum tubes.

No, the Sigma 170i is a pure analog integrated amplifier. It does not feature an internal digital-to-analog converter or a phono stage, so you will need to use external components for digital sources or vinyl playback.

Class A operation is prized for its linearity and lack of crossover distortion, which contributes to the amplifier's signature sweet treble and rich, detailed midrange. It provides a highly musical and refined sound profile that is characteristic of high-end tube amplification.

Yes, the amplifier includes a dedicated Cinema Bypass input. This allows you to integrate the unit into a home theater setup, letting your surround sound processor control the volume for the front left and right channels while using the VAC for high-quality stereo amplification.

While the iQ system manages bias automatically, you are still using a tube-based design with 10 total tubes. You should expect to replace the tubes periodically as they wear out, though the iQ system helps ensure they last as long as possible before needing replacement.

With 85 watts per channel and a robust power bandwidth, the Sigma 170i is capable of driving a wide range of speakers with authority. However, it is specifically optimized for an 8-ohm output impedance, so it performs best when matched with speakers that maintain a stable impedance curve.