FACTOIDS & TRIVIA
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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