- 600W, bass two-space rack-mount head-unit, hybrid three-tube chassis, preamp: 3 X 12AX7, 12 tube-driven power Mos-Fets, two independent blendable channels, front black control panel, two inputs (active/passive), Vaccum Tube Channel controls: seven black knobs (g, t, m, b, MV, compression threshold, compression freq.), nine-band graphic EQ, EQ switch, bright/normal switch, hi gain/normal mix switch, compression ratio switch, Field Effect Channel controls: seven black knobs (MV, t, m, b, bass freq., compression threshold, compression freq.), nine-band graphic EQ, EQ switch, bright/normal switch, hi/lo bass shift switch, compression ratio switch, All: Channel mix knob, output level knob, power switch, rear panel: six external select EQ jacks, two XLR speaker outs, two 1/4 in. speaker outs, effects loop with mix knob, crossover level, and five-way rotary FX loop auto knob, XLR balance line out with level control and post/pre switch, tuner out, six-way rotary channel select switch, mute switch, footswitch jack, black casing, six-button footswitch included, mfg. 1995-2002.

- 500W, four space rack-mount head-unit only, all-tube chassis, preamp: 4 X 12AX7, power: 12 X 6L6, two channels, front black control panel, two inputs, six black knobs (m, b, t, MV, v1, v2), seven band EQ, effects loop with level control, fan cooled, black casing, mfg. 1988-2007.

- 250W/125W, head-unit only, all-tube chassis, preamp: 3 X 12AX7, power: 4 X KT88, single channel, front black control panel, one input, eight black knobs (g, b, m, t, voice, MV, DI level, solo), three-band EQ, active/bright switch, mute switch, 250W/125W switch, DI switch, lift/ground switch, power switch, standby switch, rear panel: mute jack, voice jack, solo jack, effects loop, tuner jack, slave jack, three speaker jacks, footswitch jack, DI XLR out jack, optional four-button footswitch, slipcover included, 7.5 in. tall, 16.25 in. wide, 9.5 in. deep, 29 lbs., top handle, black casing, mfg. 2013-present.

- 465W/250W/125W, head-unit only, all-tube chassis, preamp: 3 X 12AX7, power: 8 X KT88, single channel, front black control panel, one input, eight black knobs (g, b, m, t, voice, MV, DI level, solo), three-band active/passive EQ, nine-band graphic EQ, active/bright switch, mute switch, 465W/250W/125W switch, EQ switch, DI switch, power switch, standby switch, rear panel: mute jack, voice jack, solo jack, EQ jack, effects loop, tuner jack, slave jack, five speaker jacks, footswitch jack, DI XLR out jack, DI lift/ground switch, loop ext. switch, optional five-button footswitch, slipcover included, 7.44 in. tall, 18.87 in. wide, 13.19 in. deep, 49 lbs., black casing, mfg. 2013-present.

- 465W/250W/125W, head-unit only, rackmount configuration, all-tube chassis, preamp: 3 X 12AX7, power: 8 X KT88, single channel, front black control panel, one input, eight black knobs (g, b, m, t, voice, MV, DI level, solo), three-band active/passive EQ, nine-band graphic EQ, active/bright switch, mute switch, 465W/250W/125W switch, EQ switch, DI switch, power switch, standby switch, rear panel: mute jack, voice jack, solo jack, EQ jack, effects loop, tuner jack, slave jack, five speaker jacks, footswitch jack, DI XLR out jack, DI lift/ground switch, loop ext. switch, optional five-button footswitch, slipcover included, black casing, mfg. 2013-present.

- 750W (@ 2Ohm), two-space rack-mount head unit, hybrid Simul-State chassis, preamp: 4 X 12AX7, 8 stage vacuum tube preamp, power: 20 tube driven MOSFETs, single channel, front black control panel, single input, nine knobs (OD, g, b, passive m, active m, freq., t, MV, OD Master), tuner output, two fan cooling system, black casing, disc.

- similar to the Big Block 750, except in classic head configuration, black covering, mfg. 2005-disc.

- 1400W @ 2 ohms (1200W @ 4 ohms, 700W @ 8 ohms), three-space rack-mount head unit, hybrid Simul-State chassis, preamp: 4 X 12AX7, 8 stage vacuum tube preamp, power: 22 tube driven MOSFETs, two channels, front brushed aluminum control panel, two inputs, 20 knobs (OD, OD level, g, b, passive m, active m, freq., t, MV per channel, solo, output), tuner output, two fan cooling system, five-button footswitch, black casing, mfg. 2006-2010.

- similar to the Big Block Titan V12, except is mounted in a traditional cabinet, black covering, mfg. 2006-2010.

- 200W, bass head-unit, nine-tube chassis, preamp: 3 X 12AX7, power: 6 X 6L6, solid-state rectifier, single channel, front black control panel, single input, five black knobs (v, t, m, b, MV), seven-band graphic EQ, EQ footswitch jack, EQ switch (on/off/footswitch), standby switch, power switch, rear panel: effects loop with blend knob, speaker mute switch, ground lift switch, XLR direct out, four speaker jacks (two 4 ohm, two 8 ohm), black covering, black grille, mfg. 1997-2001.

- similar to the Buster! Bass 200 Head, except in combo configuration with 1-15 in. original EVM 15L speaker and an HF driver, recessed metal handles, and Tone Luggage Transport System, mfg. 1999-2001.

- similar to the Buster! Bass 200 Head, except in combo configuration with 2-10 in. PAS speakers and an HF driver, recessed metal handles, and Tone Luggage Transport System, mfg. 1999-2001.

- 300W @ 4 ohms (165W @ 8 ohms), bass two-space rackmount head, hybrid chassis with 1 X 12AX7 preamp tube and eight power MOSFETs, single channel, front black control panel, single input, six black knobs (g, b with push/pull deep switch, m, t, di level with a push/pull pre switch, MV with a push/pull mute switch), power switch, rear panel: two 1/4 in. speaker jacks, mute switch jack, tuner out jack, effects loop with bypass switch, XLR out with ground/lift switch, black casing, mfg. 2010-disc.

- similar to the M3 Carbine, except in standard head configuration with black Bronco vinyl covering, available in regular and short widths, slip cover included, mfg. 2010-disc.

- similar to the M3 Carbine, except in combo configuration with 1-12 in. PH Neo 300 speaker, tri port, player control, tilt and roll designed cabinet, black Bronco vinyl covering and black jute grille, slip cover included, mfg. 2010-disc.

- 600W @ 4 or 2 ohms (320W @ 8 ohms), bass two-space rackmount head, hybrid chassis with 1 X 12AX7 preamp tube and eight power MOSFETs, single channel, front black control panel, single input, seven black knobs (g, b with push/pull deep switch, m, five-way voice switch, t, di level with a push/pull pre switch, MV with a push/pull mute switch), active/passive input switch, power switch, rear panel: four voice function switch jacks, mute switch jack, two Speakon outs with ohm switch, tuner out jack, effects loop with bypass switch, XLR out with ground/lift switch, black casing, mfg. 2008-present.

- similar to the M6 Carbine (Fathom 600), except in standard head configuration with black Bronco vinyl covering, slip cover included, mfg. 2008-present.

- similar to the M6 Carbine (Fathom 600), except in combo configuration with 2-12 in. PH Neo 300 speakers, tri port, player control, tilt and roll designed cabinet, black Bronco vinyl covering and black jute grille, slip cover included, mfg. 2008-2010.

- 900W @ 4 or 2 ohms (450W @ 8 ohms), bass two-space rackmount head, hybrid chassis with 1 X 12AX7 preamp tube and ten power MOSFETs, single channel, front black control panel, single input, eight black knobs (g, b with push/pull deep switch, m, t, threshold, ratio, five-way voice switch, MV with a push/pull mute switch), nine-band graphic EQ, active/passive input switch, graphic EQ on/off switch, comp on/off switch, power switch, rear panel: two Speakon outputs with impedance switch, footswitch jack, voice active/defeat switch, tuners out, effects loop, XLR direct out with pre/post and lift/ground switch, black casing, mfg. 2009-present.

- similar to the M9 Carbine, except in standard head configuration with black Bronco vinyl covering, slip cover included, mfg. 2009-present.