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- 120W, 4-15 in. 421A Altec speakers (2-15 in. speakers in each cabinet), bass piggyback with two speaker cabinets, solid-state chassis, two channels, silver front control panel, four inputs (two for each channel), seven knobs (Ch 1: v, t, b, mid-range, Ch. 2: v, t, b), ultra hi and ultra lo switches for each channel, Ch. 1 mid-range freq. select, black covering, blue/gray grille, mfg. 1969-1971.
Ampeg borrowed a design from the Acoustic 360 in the SBT by including only the pre-amp in the head unit and adding a separate power amp to drive each speaker cabinet. The speaker cabinets featured input jacks, a level control, and an on/off switch as well as a four-wheel dolly. Because the head alone is unable to drive a normal speaker cabinet, it is virtually worthless without the cabinets it was sold with originally.
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- 120W, 4-12 in. 417B Altec speakers (2-12 in. speakers in each cabinet), guitar piggyback with two speaker cabinets, solid-state chassis, two channels, reverb, tremolo, vibrato, silver front control panel, four inputs (two for each channel...
- similar to the BT-25, except has 2-15 in. Altec Lansing speakers, mfg. 1969-1970.
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- 120W, 4-12 in. Altec Lansing speakers, piggyback configuration, solid-state chassis, two channels, tremolo, vibrato, reverb, front top silver control panel, four inputs (two per channel), nine black and silver knobs (Ch. 1: v, t, b, s, i,...
- 100W, 2-15 in. JBL D-140F speakers in a column style cabinet, piggyback-style bass amp with separate head and cabinet, solid-state chassis, two channels, front top silver control panel, four inputs (two per channel), six knobs (Ch. 1: v,...
- 85W, 1-15 in. speaker, multi-purpose combo/piggyback Portaflex design, solid-state chassis, two channels, front chrome control panel, four inputs (two per channel), six knobs (Ch. 1: v, t, b, Ch. 2: v, t, b), ultra hi switches for each ch...
