MINT CONDITION IN BOX WITH INSTRUCTIONS!From the Euthymia site: Youmay have heard that for a period of time in the 1970's,Electro-Harmonix changed the circuit of their legendary Big Muff Pi*from onebased on discrete transistors to one based on integrated circuitoperationalamplifiers. This is true.As a matter of fact, the opamp Big Muff Pi was thefirstfuzzbox I ever fell in love with, back in 1983. I didn’t know that itwas anopamp one until I bought my own Big Muff and thought it soundeddifferent frommy friend’s. His later needed repair, and when I opened the case tocheck itout, I saw that the printed circuit board had a pair of integratedcircuits onit, where mine had transistors.Over the next 20 years, I never again encountered aBig MuffPi made with opamps. Mike Matthews of E-H went out of business a coupleoftimes, then got into the vacuum tube business, started making Big Muffsagain, and thenlaunched a new Electro-Harmonix with a mix of historical E-H effectsand newones. Still no opamp Big Muff Pi.I myself started building and selling effects,helpedgreatly by the information available on the www, but when I triedbuildingopamp Big Muffs from the schematics I found on the web, they didn’twork.Finally, I got my hands on an actual unit, and sat down with it to seeif I could learn its secrets and make myown.Itworked, and once again I heard that immense yowlthat only an opamp-based Big Muff circuit can make. And once again, themusic-playing public can get that sound for their very own.Unlike the old one, mine has true bypass switching, a fiberglassprinted circuit board, and a cast aluminum case. As with the rest of the Euthymia pedals, I use silver Teflon wire for all interconnections.A 9V dc power jack is now standard on every ICBM Fuzz.WORLDWIDE AND EXPRESS SHIPPING AVAILABLE!International Buyers: Standard shipping has NO TRACKING but a customs number. I recommend buying insurance $4. Express Shipping takes 5 days or so. It comes with a tracking number.Buyer is responsible for import taxes, customs fees, etc.