Picture courtesy of Robert Stamps, California, USA
The first version of this very rare old amp was produced from 1961 to late-1962. A combo of a very strange and unique design, it was actually two amplifiers combined into one cabinet. The main amplifier section was a straightforward 15 watt output unit fitted with tremolo and feeding a 12" speaker . This was paired up with the 6 watt output F-W Stereo Reverberator amplifier/ 10"x6" elliptical speaker to give a total of 21 watts output through the two speakers. The level of reverberation was controlled simply through the 6 watt amplifier and its dedicated elliptical speaker.
The control panel for this strange amplifier provided two channels, each with two inputs and own volume and tone controls, tremolo speed and depth controls, and reverberation balance, intensity, and frequency controls.
A second re-boxed version of the Auditorium 21 was introduced from late-1962. This had the revised F-W cabinet design with the white padded and studded front as used by the contemporary Black Star and Bass 15 models.
The Auditorium 21 appears to have had a very limited run, Certainly, there are not many still about!