  | 
Late BTO
 (circa '72)
 atop
 Early BTO (1967)
 (LB260D/B260D)
 The late version BTO incorporated some important changes.  The chassis was
mounted to the bottom of the cabinet and the front panel had holes and a grille
cloth; all done to improve cooling.
 Dedicated lead and bass versions were no
longer available, replaced by a single "LB" version. |