With the newest version of Electro-Harmonix's iconic Big Muff Pi, once again made in New York City, they have returned to the original "finest harmonic distortion-sustain device developed to date". The sound is outrageous, and any guitarist who has been relying on the Russian-made Sovtek Big Muff is in for a sonic treat. The venerable 12AX7(EH) twin triode vacuum tube is still made in Russia, but the Russians have been the kings of vacuum tube technology for several decades now. The Big Muff's melodic tone is a deep tapestry of harmonics building on harmonics, powerful distortion sound that will blow you away whether you crank your amp up to 11, or are practicing quietly.There are less expensive distortion boxes, almost all purely digital. The big Muff Pi outshines the rest by doing one thing, and doing it well.NOTE: If you intend to buy an A/C adapter, there is conflicting information as to which type of plug fits the pedal, and Electro-Harmonix themselves has conflicting information on their website. The power supply most commonly recommended is incorrect. It has a mini phone plug. This plug WILL NOT FIT the socket on the Big Muff. Its socket takes a 2mm hollow plug with center negative. These adapters are made by Electro-Harmonix and Roland, but it can be difficult to figure out which is which on Amazon's site. My recommendation is to stick to the battery until you need an adapter, then bring the Big Muff into a guitar store to make sure.