- preamp only, one-space rack mount head, five tube chassis: 5 X 12AX7, three channels, four modes (rhythm, boost, lead I, lead II), front black control panel, single input, 13 black knobs (Ch. 1: g with push/pull boost, t, m, b, MV, Ch. 2: g, t, m, b, p, MV, All: g, MV, output), five-band graphic EQ, footswitch jack, lo gain/high gain switch, EQ in/EQ Lead II/footswitch switch, mode switch, power switch, four-button footswitch included, black casing, mfg. 1998-2001.

- preamp only, two-space rack mount head, six tube chassis: 6 X 12AX7, two channels, six modes (clean, fat, bright, raw, vintage, modern), front black control panel, single input, 15 chrome knobs (Ch. 1: g, t, m, b, p, MV, Ch. 2: g, t, m, b, p, MV, All: record output level, live output level, solo output level, clean/fat/bright mode switch, raw/vintage/modern mode switch, bright switch, pad switch, preamp voicing switch, channel switch, standby switch, power switch, rear panel: lift/ground switch, parallel effects loop with FX mix knob, stereo recording outputs, stereo live outputs, three external switch ports (modern, Ch. 1/Ch. 2, and Solo), additional input jack, two-button footswitch, black casing, mfg. 2002-present.

- preamp only, one-space rackmount guitar head unit, five-tube chassis: 5 X 12AX7, single channel, eight modes (Vintage Fat Rhythm, Modern hyper-clean Rhythm, Vintage Mark I lead, Modified Higher Gain Mark I, British Lead, Mark IV Pentode Lead, Mark IIC+ Lead, Modified Mark IV Searing Lead), front black control panel, single stacked black knob (A/B output), 90 user presets, 128 MIDI program locations, complete digital display with push button controls, rear panel: full MIDI in, MIDI through, MIDI out, four footswitch jacks, stereo main and recording outputs, programmable effects loop with stereo returns, single input, black casing, mfg. 1991-present.

- 40W (20W per channel), one-space rackmount power amp guitar head, seven-tube chassis, preamp: 3 X 12AX7, power 4 X EL84, two channels (stereo output), front chrome (early models) or black (later models) control panel, four chrome (very early and later models) or black chrome (earlier models) knobs (Ch. 1: p, v, Ch. 2: v, p), power switch, standby switch, rear panel: two inputs (one for each channel), six speaker outputs (three for each channel, one 8 ohm, two 4 ohm), two slave outputs (one per channel), black casing, mfg. 1995-2010.

- 100W (50W per channel), two-space rackmount power amp guitar head, seven-tube chassis, preamp: 3 X 12AX7, power 4 X 6L6, two channels (stereo output), front black control panel, four black numbered knobs (Ch. A: v, p, Ch. B: v, p), power switch, standby switch, hi/lo power switch, black casing, mfg. 1989-2001.

- 200W (100W per channel), two-space rackmount power amp guitar head, eleven-tube chassis, preamp: 3 X 12AX7, power 8 X EL34/6L6, two channels (stereo output), two modes (Normal, Recto Preamp), Smart Power modern jack, front black control panel with silver insert, four chrome knobs (Ch. A: v, p, Ch. B: v, p), power switch standby switch, rear panel: four inputs (two per channel, one of each mode), EL34/6L6 bias switch, ground switch, Smart Power modern switch jack, six speaker outputs (three for each channel, one 8 ohm, two 4 ohm), black casing, mfg. 2002-disc.

- 100W (50W per channel), two-space rackmount power amp guitar head, seven-tube chassis, preamp: 3 X 12AX7, power 4 X 6L6/EL34, two channels (stereo output), front black control panel, four chrome knobs (Ch. A: v, p, Ch. B: v, p), power switch standby switch, rear panel: two inputs (one per channel), 6L6/EL34 bias switch, ground switch, six speaker outputs (three for each channel, one 8 ohm, two 4 ohm), black casing, mfg. 2002-present.

- 180W (90W per channel), two-space rackmount power amp guitar head, eleven-tube chassis, preamp: 3 X 12AX7, power 8 X 6L6, two channels (stereo output), Smart Power (Deep, Half Drive, Modern) line/instrument input select, front black control panel, four chrome (later models) or black chrome (earlier models) knobs (Ch. A: v, p, Ch. B: v, p), power switch standby switch, rear panel: two inputs (one per channel), line/instrument switch, ground switch, three external switch jacks (deep, modern, half drive), six speaker outputs (three for each channel, one 8 ohm, two 4 ohm), black casing, mfg. 1992-present.