- 350W, power amp only, two-space rack-mount head-unit, solid-state chassis, front black control panel, two knobs (v, p), power switch, rear panel: polarity switch, convenience outlet, two 1/4 in. speaker jacks and a pair of red/black speaker wire connections, two inputs, black casing, mfg. 1992-93.

- 1300W mono (650W per side stereo), stereo power amp only, two-space rack-mount head-unit, solid-state chassis, front black control panel, four knobs (Ch. 1: v, p, Ch. 2: v, p), power switch, rear panel: polarity switch, convenience outlet, two 1/4 in. speaker jacks and a pair of red/black speaker wire connections, two inputs, black casing, mfg. 1992-95.

- preamp only, single-space bass rack-mount head-unit, single 12AX7 preamp tube, two channels, front black and gray control panel, single input, 12 knobs (Clean: g, bass with push/pull low boost, mid, treble with push/pull high boost, volume push/pull compression, OD: gain with push/pull boost, b, m, mid-range freq., t, v with push/pull gate, MV), input pad switch, mute switch, channel select switch, combine switch, power switch, rear panel: footswitch jack, two preamp out jacks (OD, Clean/Mix), two effects loop (one per channel), two XLR balanced line outs with level controls (one per channel), tuner out jack, black casing, 19 in. wide, 1.75 in. tall, 10 in. deep, 10 lbs., mfg. 1999-2005.

- preamp only, single-space bass rack-mount head-unit, four-tube chassis: 2 X 12AX7, 2 X 12AU7, single channel, front black and gray control panel, single input, seven black knobs (g, five-position ultra low, b, m, five-position mid-range freq. selector, t, MV), input pad switch, mute switch, ultra high switch, bright switch, power switch, rear panel: footswitch jack, two preamp out jacks, XLR transformer balanced line out with pre/post and ground/lift switches, tuner out, black casing, 19 in. wide, 1.75 in. tall, 10 in. deep, 7 lbs., mfg. 2004-06.

- preamp only, single-space rack-mount head-unit, five-tube chassis, preamp: 5 X 12AX7, single channel, front black control panel (1994-99) or black and gray control panel (1999-2006), single input, seven knobs (g, drive, b, m, five-position mid-range freq. selector, t, MV), nine-band graphic equalizer with level slider control, input pad switch, mute switch, ultra lo switch, bright switch, ultra hi switch, graphic EQ on/off switch, power switch, rear panel: footswitch jack, two preamp out jacks, effects loop, tuner out jack, XLR balanced line out with pre/post EQ switch, black casing, 19 in. wide, 1.75 in. tall, 10 in. deep, 9 lbs., mfg. 1994-2006.

- 560W @ 16 ohms mono (960W @ 8 ohms mono, 1560W @ 4 ohms mono, 2 X 780 @ 2 ohms stereo, 2 X 480W @ 4 ohms stereo, or 2 X 280W @ 8 ohms stereo), three-space rackmount head, bass power amp, MOSFET chassis, two channels (A & B), front black control panel, power switch, reset button, 1/4 in. balanced inputs and blind post outputs, black casing, 19 in. wide, 5.25 in. tall, 12.5 in. deep, 33 lbs., mfg. 1996-98.

- 900W @ 8 ohms (1200W @ 4 ohms mono, 2 X 600 @ 2 ohms), three-space rack-mount head-unit, bass power amp, MOSFET chassis, two channels, front black control panel, two black knobs (Ch. A v, Ch. B v), limiter button, power switch, rear panel: convenience outlet, three Speakon jacks (Ch. A, Ch. B, mono/bridged), four 1/4 in. speaker jacks, stereo/mono switch, power amp A and B inputs and outputs, black casing, 19 in. wide, 5.75 in. tall, 10 in. deep, 39 lbs., mfg. 2004-06.

- preamp only, one-space rack-mount head-unit, hybrid chassis with a tube preamp, single channel, front black control panel, two inputs (normal and bright), five knobs (v, b, m, five-position mid-range freq. selector, t), six-band graphic EQ with level slider control, ultra low switch, balance line out switch, ultra high switch, graphic EQ switch, footswitch jack, power switch, black casing, mfg. 1991-95.

- 300W, power amp only, similar to the SVT original with 6 X 6550 power tubes, mfg. 1991-95.