Amplifier

FIG. 1 is a first top perspective view of an amplifier in a first configuration showing our new design; FIG. 2 is a second top perspective view thereof; FIG. 3 is a top view thereof; FIG. 4 is a bottom view thereof; FIG. 5 is a side view thereof; FIG. 6 is a side view of the opposite side of FIG. 5 ; FIG. 7 is a front view thereof; FIG. 8 is a rear view thereof; FIG. 9 is a first top perspective view of the amplifier in a second configuration; and, FIG. 10 is a second top perspective view of the amplifier in the second configuration. The broken lines shown in the drawings illustrate portions of an amplifier that form no part of the claimed design.