sentences:  SVT originally stood for "Super Vacuum Tube", but Ampeg has since revised the meaning of the acronym to "Super Valve Technology", with the word "valve" referring to the vacuum tubes (called "valves" in Britain and some other regions) used in the amp.Following Unimusic's acquisition of Ampeg in 1967, the new company management was actively pursuing the rock market, opening offices in Chicago, Nashville, and Hollywood, and developing products designed to address the needs of rock musicians.When The Rolling Stones began rehearsing for their 1969 U.S. Tour in Hollywood, a power conversion failure blew up all of their UK Fender amplifiers.