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The B-12-XT and the B-18-X share identical circuits. The only difference lies in the B-12-XT’s smaller cabinet that is loaded with two 12 inch speakers. Like the B-18-X, the B-12-XT was considered by Ampeg to be a universal amp, however, it was most favorably used by guitarists. Of particular interest on the B-12-XT/B-18-X amps is the switchable reverb. One example of the usefulness of this feature is that it allows a musician to play accordion melody keys through channel one with reverb while having a dry signal in channel two for the bass keys. The B-12-XT shown exemplifies the “wedding cake” tiered effect of the Portaflex series, and sports a short lived cosmetic style found only in 1967 and early 1968. The chassis is the old-style chrome stamped type with light up logo, but the cabinet is covered with smooth black vinyl with chrome trim around the grill. Sometime in 1968, the stamped chrome chassis, light up logo, and chrome trim strip were dropped in favor of an extruded aluminum chassis. The B-12-XT was discontinued that same year.


Power Amp:
  Tube; 2 x 7027A, 50 watts RMS @ 16 ohms

Preamp:  Tube; 4 x 12AX7, 1 x 7199, 1 x 6CG7

Rectifier:  Tube; 1 x 5AR4

Speakers:  2 x 12" Jensen EM1202

Channels:  2; 2 inputs per channel (Guitar, Accordion)

Effects:  Vibrato, reverb

Controls:  Bass, treble, volume; tremolo intensity and depth, reverb intensity, footswitch for tremolo and reverb

Dimensions:  22 H x 28 1/2 W x 12 1/2 D inches

Weight:  90 lb.

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