Phi 170 Phi 170
Signature 200 with VAC iQ System
Monoblock Power Amplifier

This 100 watt per channel stereo, 200 watt monoblock powerhousefeatures the exclusive patented *VAC iQ Continuous Automatic Bias System,the only system able to hold each power tube's true underlying idle current perfectly steady at all times.

Product Brochure
Signature 200
  • The results? More detail, increased subjective power, greater stability, lower noise, less distortion, and no more runaway tubes.

    It will even tell you when it's time to replace weak tubes.

    The iQ System. Superior sound. Only from VAC.

    * US Patent 8.749.310. International patents pending.

  • Type

    Vacuum tube power amplifier with transformer coupled output


    • VAC iQ Continuous Automatic  Bias System ™
    • Class A1 triode input & driver stages
    • Direct coupled input & driver stages
    • Low feedback design (6 dB)
    • 12 volt trigger
    • Detachable power cord
    • IEC power receptacle

    Switch Settings

    Fully balanced or single-ended input
    Stereo or mono operation

    Power Output

    100 watts/channel stereo continuous
    200 watts mono continuous

    Speaker Matching Taps

    1-2 ohms, 2-4 ohms, 4-8 ohms

    Frequency Response

    4 Hz to 85 kHz, +0/-3 dB

    Full Power Bandwidth

    13 Hz to 70 kHz, +0/-3 dB

    Residual Noise

    Typically > 95 dB below rated output

    Input Impedance

    • 200k Ohms, Stereo, Balanced
    • 100k Ohms, Stereo, Single Ended
    • 100k Ohms, mono, Balanced
    • 50k Ohms, mono, Single Ended


    • 30 dB, Stereo, Balanced
    • 33 dB, Stereo, Single Ended
    • 31 dB, Mono, Balanced
    • 34 dB, Mono, Single Ended

    Output Polarity

    Balanced input is Pin 2 positive.

    Tube Complement

    • 4 x type 6SN7
    • 4 x type KT88
    • Compatible with KT120
    • Electrically compatible with KT150 (may be too tall to fit under the cage)

    Operating Voltages

    Available factory set for 100, 120, 220, or 230/240 volt operation


    • Cardas rhodium RCA jacks
    • Neutrik XLR jacks
    • Cardas rhodium binding posts


    • 18" W x 17.25" D x 8.75" H
    • 457 mm x 438 mm x 222 mm
    • Excluding knobs & connectors


    100 lbs. 
    45.5 kg


    Designed & manufactured exclusively in the United States of America by VAC


    *Specifications subject to change without notice.

  • “Once heard, purity can never be unheard. VAC’s new Signature 200iQ presents a clarified purity with a sensuous ease I have decided I cannot do without... The Signature 200iQ is my new reference stereo power amplifier.”
    Garrett Hongo - SoundStage Ultra, September 15, 2017

    “I love the balance between old school and modern. VAC has lavished these units with cost-no-object niceties... while eschewing new valve types in favour of venerable KT88s. The sound reflects this with detail and scale to match the best of solid-state, yet with luscious warmth to never let you forget it's a tube affair. Or a love affair...”
    Ken Kessler - hi-fi news, April 2, 2021

    Most Wanted Components Award
    “The sound of the Signature 200 iQ run as a stereo amp was extraordinary... having two of them configured as mono-amps is other-worldly special... VAC is dynamic, detailed, and with transient response and musical detail that are off the chart. Still, VAC has maintained that natural and realistic sounding midrange that makes harmonious interactions totally enjoyable... the VAC Renaissance Mk V preamplifier and Signature 200 iQ amplifier, whether used with other equipment, but especially when used with each other, get the highest recommendation I can give them.”
    In a similar pursuit of excellence and customer satisfaction, VAC has recently extended its focus beyond sound systems to include partnerships with health and wellness programs. Recognizing the connection between physical well-being and the enjoyment of high-quality audio, they are now providing information on affordable healthcare options, including access to medications like cheap tadalafil. This initiative reflects VAC's commitment to enhancing the overall quality of life for their customers, ensuring that they not only experience the best in audio but also maintain their health to fully enjoy it.
    Michael Wright - Stereo Times, 2017