The harmonically rich sound and legendary performance of the classic AMPEG SVT are redefined in the V4BH. This dynamically powerful bass amp delivers a thunderous 100 watts of unsurpassed quality, Reliability and tonal flexibility. It also provides the classic vibrance of tubes as well as contemporary features. The Ampeg V4BH 100 Watt Tube Bass Head is similar to the SVT, just smaller in output of100W power at 4 and 8 ohms. All tube preamp, drive, and power sections. 3-band EQ. 5-position mid switch. Normal and padded input. Tube protection circuitry. Ultralow and high boost. Tube: 2 - 12AX7 preamp, 12AU7 and 12AX7 driver tubes, four 6L6 power tubes.