Valve Amplification CompanySignature 200iQusedValve Amplification Company Signature 200iQFor sale is a like-new, VAC Signature 200 iQ power amplifier, which features the VAC iQ Continuous Automatic Bias System - Kevin Hayes' latest VAC innovation. I bought it brand new for $14,000 in M...8600.00

Valve Amplification Company Signature 200iQ [Expired]

no longer for sale

For sale is a like-new, VAC Signature 200 iQ power amplifier, which features the VAC iQ Continuous Automatic Bias System - Kevin Hayes' latest VAC innovation. I bought it brand new for $14,000 in March 2018 to use with a pair of Focal Sopra 3s and it sounds awesome. It's by far the best amp I've owned, or heard for anywhere near this amount of money, but I rarely use it and now could use the money for my son's college tuition. My loss is your gain.  I would estimate that it has about 150 hours of use, which is very little.  It works perfectly and is simple to use. 
The VAC 200iQ came with a standard set of VAC's stock Gold Lion KT88 tubes which I'm using, and I bought an extra set, which are still untouched (packed in bubble-wrap) and I'm including them in the price. I have the original box and packing materials and the cage as well.  The build quality of this amp is amazing - it's built like a tank and weighs 100 lbs - it seems like it's built to last for many years.  Reviews say that it's a major improvement in sound quality and technology from the previous model (the VAC Phi 200); and it has the automatic bias system which takes all of the guess work and headache out using a tube amp (see the review below).  It has speaker connections for 1-2 Ohms, 2-4 Ohms and 4-8 Ohms and it was more than adequate to drive my Sopra 3s, although it can also be used in a pair if anyone wanted.   
The pictures below don't do it justice. The front is a black gloss that almost looks like it has sparkles in it when you look close up - which you see in the pictures. There are no scratches or dings. It was installed by a professional audio company and I only took it out of the shelf to take pictures of it.  I can send more pictures if anyone wants. 
I know it's a lot of money, but I've priced it at the going rate for this amp used and it's a great deal for the number of playing hours. Also, I'd be happy to speak to anyone by telephone or over email who is serious about purchasing it. I would not be selling it if I was using it and didn't need the money.   

I'm willing to drive up to a couple of hours to meet someone after payment if they preferred (local pickup is easier), or could arrange shipping at the buyer's cost (shipping and insurance pre-paid). I don't know how much the shipping would be, as this is obviously a heavy item.     
Here are some specs and helpful links. which I hope will help someone who is interested make a decision:
The dimensions of the amp are 8"W x 8.75"H x 17.25"D.  Here's a link to the product page: You'll have to cut and paste it into a browser.    
I believe that I have the manual somewhere - just need to look, but it's not a complicated amp.  The amp doesn't come with a remote.     
Here's a review of the 200iQ, which also compared it to the older Phi200. 

For quick reference, the serial number is: 1726801. 
Specs from the VAC website:


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

Thanks for looking! 

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