Portable musical instrument amplifier with a movable plug
FIG. 1 is a top, side and end perspective view of a portable musical instrument amplifier with a movable plug showing my new design; 
     FIG. 2 is a side elevational view thereof, the undisclosed opposite side being a mirror image; 
     FIG. 3 is an end view with the plug shown in an alternate position thereof; 
     FIG. 4 is a side elevational view of FIG. 3, the undisclosed opposite side being a mirror image; 
     FIG. 5 is an end view of FIG. 3; 
     FIG. 6 is a top plan view of FIG. 3; and, 
     FIG. 7 is a bottom plan view of FIG. 3, the fragmentary portion of the plug is shown for clarity of illustration.