It's the predecessor to the Pro 3X, has a 45w, 12AX7 tube pre-amp, pre and post gain controls and a high freq contour control. The sound of the horn alone is shrill and piercing (AM radio) to say the least, but plugged into my CT and/or Vox 1/2 stacks, the pulsing base fills the vibe. Still playing with the balance and position of the box, but I really dig the pseudo stereo through both 1/2 stacks, got one in each corner of the room. I am glad I went for the MS instead of a digital box, much cleaner and very true to the original tone. Would like to find a MS Gas Pedal, anyone got one laying around?

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Doing the work of three men. . . Larry, Moe & Curly