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Item # 110020443 | Customer Ratings: Ratings ( 5 Based on 1 reviews)

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Groove Tubes SAG-AT7-MPI Matched Phase Inverter Tube Changing Kit
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      Groove Tubes SAG-AT7-MPI Matched Phase Inverter Tube Changing Kit (110020443)
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The Groove Tubes SAG-AT7-MPI Matched Phase Inverter Tube Changing Kit contains specially selected and matched 12AT7 vacuum tubes for critical audio or guitar/bass amplifier use. Intended when a match of the two sides of the triode are desired for phase inverter or driver use.

This 12AT7 tube is a dual triode where the A and B sides are closely matched for use in critical high end audio applications or for use in the phase inverter or driver position of musical instrument amplifiers.

The benefit of this Groove Tubes vacuum tube in a guitar or bass amplifier is a matched output section. At lower frequencies such as dropped tunings, 7 string guitars, or bass guitars, the upper and lower portions of the output waveform will be much more equal. When this waveform is not equal, differences are cancelled out in the NFB loop of class A/B amplifiers and are noticed as a lack of sustain or apparent "dead spots" in areas of the fret board.

At high levels at all frequencies, sustain will be improved. This is even more critical in Class A amplifiers such as the Vox AC-30 and Matchless amplifiers.

Use this MPI in any application where a phase inverter / driver of the ECC81/12AT7 tube is specified. The phase inverter / driver position of a guitar or bass amp is a current driving position, and not part of the tone generation stage. These tubes are selected for specific characteristics, so they may be a 12AT7A, 12AT7C, or other 12AT7 tubes.

Use of a 12AT7 in place of a 12AX7 will yield more clean headroom in your output section. The two tube types are interchangable without any adjustment required, so feel free to experiment!

Country of origin: Russia

Groove Tubes SAG-AT7-MPI Matched Phase Inverter Tube Changing Kit Features:

  • Country of origin: Russia


Groove Tubes SAG-AT7-MPI Matched Phase Inverter Tube Changing Kit Specifications:

  • Country of origin: Russia


Groove Tubes SAG-AT7-MPI Matched Phase Inverter Tube Changing Kit

90 day warranty on power tubes, includes replacement of whole set if one tube goes bad.
180 day warranty for preamp tubes.
3 year warranty on SubstiTubes and Solid State Rectifier.
Check with M-Audio for warranty on GT microphones.

Get your gear covered!

Now you can get added warranty protection for your new gear. Pro Coverage steps in where the manufacturer's "normal wear and tear" ends. Our PRO COVERAGE program offers you UPGRADED COVERAGE if your product ever fails!

Pro Coverage includes:

  • Accidental damage protection (new gear only)
  • Expedited Repair
  • Free Shipping (for returns or repairs)
  • 100% Coverage for Commercial Use
  • Extended Return Period
  • Extended Price Protection
  • No Lemon Guarantee
  • Free Transfer of Coverage to a new owner
  • Repair Costs Covered for up to 3 years from date of purchase
  • Repairs Can Be Authorized Toll-Free by Phone or the via the web
Product Reviews
(Based on 1 reviews)
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  • Un expected!

    As reviewed by James Savino on 4/30/2014

    I am a big fan of JJ tubes. I use them in my amps, I buy them from online tube stores and order them for high gain. I generally order a "matched triode" JJ tube for my phase inverter. I read online that a JJ preamp tubes do not make the best sounding and "feeling" phase inverter tube. I doubted this. I also doubted that groove tubes were worth the money. I broke down an bought one of these tubes to sort of swap out with one of my regular JJ matched phase inverter spot and WHOA! This tube made quite a difference! The break up was just a lot smoother when rolling your volume knob on your guitar back, and slowly bringing it back in. The tone difference was most noticeable on clean, and crunch. This tube kinda helped my baritone when playing open notes to really smooth out with high gain. This is a great tube, I don't recommend much a need for other groove tubes, but I believe this specific one is a good choice. They must be using some very special equipment at groove tubes to sort out the perfectly matched ax7 MPI tubes. This thing is great TRY IT! It is a cheap Chinese sino 12ax7 but hey... it works great.

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