This amp is squeaky clean and painfully loud, both of which are magnified by the factory installed JBL D-120F speakers.These speakers are labelled "Fender Special Design" and feature a distinctive orange and black paint job with massive Alnico magnets.My dates throughout will be a little vague, but are a good starting point.Fender started producing blackface AA763 amps in August '63 I believe.We get occasional calls here at Universal Audio from people wanting to know what era some Universal Audio, UREI or Teletronix piece they bought on the vintage market dates from.So in this post, we're offering a complete revision history of the world's two most popular compressors, the 1176 Limiting Amplifier and the Teletronix LA-2A Leveling Amplifier.Beware of someone trying to sell these to you as a "blackface" amp.
In a special twist, both channels boast reverb and tremolo, and the "custom" channel has a modified Bassman tone stack that gives modern players greater tonal flexibility with pedals.
Both channels feature high and low gain inputs, bright switches, and controls for volume, treble, middle, and bass.
The effects channel also features tremolo (labelled "vibrato") rate and intensity and reverb depth controls.
This is the last of the original CBS produced Fender Twin Reverbs, and has the highest power output of any regular Twin (this doesn't count the Super Twin or Twin Reverb II which are different beasts entirely) at 135 watts RMS.
This was achieved by incorporation an "Ultralinear" design power transformer which has an additional set of taps on the primary windings that connect to the screen grids of the tubes, increasing the output and creating a more "hi-fi" sound.