This webpage is a continuation of my SP-10 refurb project, here.
See the accompanying record cabinet here.
I considered a number of options for a plinth, but being a bit of a woodworker, I decided to build one myself, primarily using multiple layers of baltic birch plywood. Based in part on the work by Albert Porter, whose bases are here, and described here, I used 5 layers of baltic birch, with one layer of MDF. The latter was glued in with a soft glue to provide some additional damping. The base also contains a 10 pound steel bar, coupled to the SP-10 bearing via brass rod, as a motor noise drain.
Layout-wise, I decided that this was to be a dedicated base for the SP-10 and an SME 312S arm combination. I wanted to avoid the extra mechanical joint created by a separate armboard, and to me, the base also looks more finished without a separate armboard. The top layer of baltic birch would be cut to mount the arm, and a cavity would be cut out below the arm for access to the cable and to mount the arm.
The finish will be bird's eye maple for the top, surrounded by a 1/4" trim strip of wenge, with the sides of santos rosewood.
Before deciding the dimensions of the base, I laid out the design full scale on paper, including the tonearm I planned to use: a 12 inch SME 312S.
Above: The six panels of the base, being test fitted during gluing. Shown in the main SP-10 cavity is the steel bar motor noise drain that will be mounted in the bottom of the base, basically below where it sits in this photo. I drilled and tapped a 1/4"-20 hole in the center for the brass rod that will reach the bearing housing.
Above: Bird's eye maple glued and mostly trimmed. Test fitting Wenge strips for the perimeter. Note the arm mounting hole is not completely cut out in the traditional SME oval. The suggested hole is quite a bit longer than necessary (to allow arm adjustment), so I'll trim the cutout to exact size once the table is mounted to avoid the extra long cutout under the arm.
Another view of the completed setup.
See the accompanying record cabinet...