Stern uses a pair of Fender '65 Twin Reverb amps or his Yamaha G100-212. Fender also owns Jackson, Olympia, Orpheum, Tacoma Guitars, Squier, and Brand X amps. Sound reinforcement included PA, mixing desks, and solid state power amps. It also acts as a multitrack recording studio with Stompbox effects and guitar amps. There's a mic between the two amps. Vai uses EL-34 tubes by Groove Tubes in his Legacy amps. His amplification section is dominated by Ashdown amps and cabinets. There are several experimental Fender Tweed amps in blonde. In 2009, Satriani split from Peavey, and returned to using Marshall amps. Some EVs allow 120 V charging at greater than 16 amps. Professional bassists are more likely to have expensive "boutique" amps and cabinets. Corgan is noted for having used Marshall and Diezel amps. These allow charging at up to 24 amps. The song just amps you up so much. There are three types of original SVT amps.