OSP Cases | ATA Road Case | Amplifier Case for Ampeg SVT Classic 13 | ATA-SVT-13-HEAD This ATA case is custom designed to fit the Ampeg SVT Classic 13 Head Dimensions Outer 27x 17 x 15 (LxWxH without casters) 27 x 17 x 19 3/4 (LxWxH with casters) Inner 24 1/4 x 13 x 3 1/2 (Base) Inner 24 1/4 x 13 x 8 3/4 (Lid) Ball Corners with Industrial Rivets and latches Incredible professional quality - built for the road! 3/8&quot; Plywood with Black Laminate Tongue and Groove Metal Railing