- 100W, 1-15 in. EVM (B-15TEV) or 1-15 in. Ampeg Custom (B-15T) speaker mounted in a ported bass reflex cabinet, bass combo/piggyback Portaflex design, solid-state chassis, single channel, front black control panel, two inputs, seven knobs (g, low with push/pull ultra low, low mid with push/pull shift, high mid with push/pull shift, high with push/pull ultra high, stage volume with push/pull limiter, line out level), effects loop, power switch, rear panel: XLR balanced sends, 1/4 in. unbalanced, line out/line in jacks, speaker jack, headphone jack, speaker mute switch, polarity switch, removable casters, tilt-back leg, black covering, black grille, 21 in. wide, 24.75 in. tall, 15.75 in. deep, mfg. 1988-1992.

- 120W, 4-10 in. speakers in a sealed cabinet, bass piggyback configuration, solid-state chassis, two channels, front silver control panel, four inputs (two per channel), eight black and silver knobs (Ch. 1: v, b, m, t, Ch 2: v, b, m, t), three-way mid-range and ultra-hi switches for each channel, tuned reflex speaker design, black covering, black grille, mfg. 1975-1980.

- 120W, 6-10 in. speakers in a ported speaker cabinet, guitar piggyback configuration, solid-state chassis, two channels, reverb, tremolo, front control panel, four inputs (two per channel), 11 knobs (Ch.1: v, b, m, t, Ch 2: v, b, m, t, r, s, i), mid-range freq. switches and ultra hi switches for each channel, power switch, black covering, black grille, mfg. 1975-1980.

- 240W, 2-15 in. speakers, bass piggyback configuration with a separate head and cabinet, solid-state chassis, single channel, front white control panel, two inputs, four knobs (v, b, m, t), mid-range freq. switch, Ultra-hi switch, modular components, black covering, blue/gray grille (cabinet only, cabinet also has a "towel bar" handle on top), mfg. 1974-1980.

- these are two amps that were listed as mini amps. Each of these amps operated on AC or DC power. The soundcube was in the shape of a cube with the "a" logo on the side and the Buster is taller and looks a lot like a Pignose. Each amp has one knob and one input. Both of these amps were introduced in 1975. The Buster was discontinued by the end of the year, while the Soundcube lasted until 1977.