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The FLAT 4 BOOST takes advantage of VOX's newly developed Hi-Volt technology and provide not only the warm tone expected from a tube but also the all important feel and dynamics. A versatile full-range booster:
This vacuum tube booster can be used for a mid-boost treble-boost and overdrive in addition to a full-range boost. Its Baxandall tone circuit allows adjustment from the flat position to the desired boost or cut range. Raising the gain will gradually apply a low-cut giving you an overdrive sound that's strongly reminiscent of sought-after vintage tones. An independent mid-boost switch lets you switch the response of the mid-range which is ideal for playing lead. This is a great unit for blues guitarists who wish to highlight their picking nuances. Newly-developed Hi-Volt technology that overturns expectations for compact effect units
Hi-Volt technology enables the vacuum tube to operate at 200V while still running on a battery. This enables a true tube-driven sound that overturns your expectations for a compact effect unit. What is Hi-Volt?
VOX has revealed a new vacuum tube circuit technology called Hi-Volt. It delivers high voltage (200V) to a 12AX7 vacuum tube by using 6x AA batteries or the DC9V power supply.
The discrete circuit works at 20V which is still considered high voltage operation compared to other general effects products. The result is a natural and dynamic tone which is similar to that of a vacuum tube amplifier. Even though vacuum tubes are considered big by modern component size standards our engineers were able to keep these pedals small so you don't have to worry about them taking up too much space on your pedal board.