Dear Audiolabyrinth, Apart from current offerings from Win Tinnon (Saskia) and OMA, I don't think there ever was a commercially made slate plinth for anything. The original OEM plinth for the SP10 Mk3 was a nice one made of obsidian (I think). I've never seen one in the flesh, let alone owned one. For the Mk3, I then had a blank slate slab cut for me to my specs (20X23X3 inches, I believe), with chamfered corners and honed flat on both surfaces. (A company in PA will do this.) I then found a template for cutting the slate on-line as a pdf file. I had the slab shipped to a water-jet company in York, PA, and they cut the holes for the Mk3 chassis using the pdf file to program their water-jet. Then I commissioned a carpenter to make me a base using cherry wood. I bolted the bottom of the slate to the cherrywood base by drilling holes in the slate to accommodate threaded inserts, which I epoxied in place. Five or six hefty bolts.
I had already by this time gone through similar processes to make plinths for an SP10 Mk2, Denon DP80, and Lenco L75, so I had the process down pretty well by the time I found a Mk3. Except that none of the first 3 plinths received a cherrywood base, just all slate.
I had already by this time gone through similar processes to make plinths for an SP10 Mk2, Denon DP80, and Lenco L75, so I had the process down pretty well by the time I found a Mk3. Except that none of the first 3 plinths received a cherrywood base, just all slate.