- 200W, rack-mount head, solid-state chassis, front black control panel, eleven black knobs, 4-band EQ, black casing, mfg. 1984-87.

- 400W, rack-mount head, solid-state chassis, black control panel, 12 knobs, 4-band EQ, effects loop, limiter, electronic crossover, black casing, mfg. 1985-1993.

- similar to the SM-400, except has 500W output, an internal cooling fan, and a transparency control, mfg. 1993-99.

- 500W (250W per side stereo), rack-mount head unit only, tube preamp, solid-state power amp, single channel, front black control panel, two inputs (passive and active), 11 black knobs, four-band equalizer, lots of speaker and line outs, black casing, 2-space rack mount, 20 lbs., disc. 2009.

- 800W mono, 350W per channel stereo, rack-mount head, solid-state chassis, purple control panel, 15 knobs, effects loop, limiter, electronic crossover, 24 lbs., mfg. 1991-99.

- 900W (400W per side stereo), rack-mount head unit only, tube preamp, solid-state power amp, single channel, limiter, crossover, front black control panel, two inputs (passive and active), 17 black knobs, switchable equalizers, lots of speaker and line outs, footswitch, black casing, 2-space rack mount, 26 lbs., disc.

- 1500W (750W per side stereo), three-space rack-mount head unit, tube preamp, solid-state power amp, single channel, limiter, crossover, front black control panel, two inputs (passive and active), 19 black knobs, switchable equalizers, lots of speaker and line outs, footswitch, black casing, 19 in. wide, 5.5 in. tall, 19.5 in. deep, 67 lbs., mfg. 2007-disc.

- 180W (2 or 4 Ohm) or 120W (8 Ohm), rack-mount head, hybrid chassis, tube preamp, solid-state power amp, black control panel, ten black knobs, black casing, mfg. 1986 only.

- 220W, rack-mount head, solid-state chassis, black control panel, eleven knobs, 4-band EQ, adjustable crossover, limiter, black casing, 13.5 lbs., mfg. 1987-1998.

- same as the Bass 350 except for chassis venting, mfg. 1993-94.

- 350W, rack-mount head unit only, tube preamp, solid-state power amp, single channel, limiter, front black and silver control panel, two inputs (passive and active), eight black knobs, lots of speaker and line outs, effects loop, black casing, 2-space rack mount, 16.5 lbs., mfg. 1994-2002.

- similar to the Bass 350 except has SubWave circuitry and one more control knob, silver casing, mfg. 2002-09.

- 550W, rack-mount head unit only, tube preamp, solid-state power amp, Sub Wave circuitry, single channel, limiter, front black and silver control panel, two inputs (passive and active), nine black knobs, lots of speaker and line outs, effects loop, black casing, two-space rack mount, mfg. 2003-09.

- 750W, rack-mount head unit only, tube preamp, solid-state power amp, single channel, limiter, front black and silver control panel, two inputs (passive and active), nine black knobs, lots of speaker and line outs, effects loop, black casing, 2-space rack mount, 33 lbs., mfg. 1999-2002.

- similar to the Bass 750 except has SubWave circuitry (with overdrive), and one more control knob, silver casing, mfg. 2002-present.

- 160W (120W @ 4 Ohms), head-unit only, tube preamp, solid-state power amp, single channel, front blue control panel, single input, seven black knobs, effects loop, headphone jack, tuner out, black carpet covering, 12 lbs., mfg. 1990-93, 1998-2002.

- 400W, lightweight bass head-unit, hybrid chassis with a single 12AX7 preamp tube, single channel, front black control panel, single input, seven knobs (g, aural enhancer with push defeat switch, bass freq./level, mid freq./level, treble freq./level, effects blend/compressor level, MV), input pad switch, mute switch, shift switch, rear panel: power switch, Speakon speaker jack, preamp out jack, footswitch jack, XLR and 1/4 in. direct line out with level control and ground/lift and pre/post EQ switches, effects loop, black casing with chrome rails, optional two-button footswitch, 8.5 in. wide, 1.75 in. tall, 9.75 in. deep, 3.75 lbs., mfg. 2010-disc.

- 900W (400W per side stereo), rack-mount head unit only, tube preamp, solid-state power amp, single channel, chorus, overdrive, front silver control panel, two inputs (passive and active), 23 silver knobs, headphone jack, lots of speaker and line outs, blue casing, 3-space rack mount, 29 lbs., mfg. 2000-03.