Electro-Harmonix LPB-1

It was such a simple thing... In the 1960's Mike Matthews consulted a friend working at Bell Labs to help him design a distortion-free sustainer. He created a tiny box to plug into the front of the amp. Because he hadn't counted on the guitar having a low signal he put a booster transistor in the box. Even though the amp had plenty of headroom it was suddenly much louder. With a lot more volume you could really overdrive the tubes of an amp. By placing a small ad in magazines they were able to sell thousands of these great little boxes to guitarists everywhere for a modest price of $14.95. It was the start of good things to come, within a few years they were working on a fuzz device called the Big Muff that would soon become even more popular. For more info on their current line up see http://www.ehx.com/