The AMT Electronics SS-11A (Classic) Guitar Preamp builds on the success of the company's flagship effect with a new host of components and functionality. Built on a the power of two 12AX7 tubes coupled with four gain stages, this mighty effect offers three channels: clean, crunch, and lead. From there, employ features like individual three-band EQs, bright switches, and volume/gain controls to sculpt sounds from a bluesy Tweed warmth to a searing Plexi assault.