Lenco plinth? How big is too big?

Lew,

I am probably in the minority here when it comes to the issues surrounding tonearm coupling. I do believe that mounting the tonearm to the plinth in a secure way is indeed the only way to go, but I stop short of your comment regarding an interaction with the bearing. Still, it should be a non-compliant mount, in my opinion. All this begs many questions about isolation, neutrality and what it all means. It also goes to the issue of dissimilar materials in the build. Should that apply only to the plinth? I don't believe so. What I do believe is that every small part, and how that part is applied, counts. I also believe there are various ways to get there, and in the end very different turntables can reach the goal. It is a very complex process, and there are no fast answers...unfortunately.

Win, I probably overstated the case for tonearm coupling. As you know, there ARE those who do advocate firm coupling to the bearing. However, your opinion carries a lot of weight with me (at least 200 lbs of slate). Anyway, I think we both agree that mounting the tonearm completely outboard of the plinth is not optimal. Like Pryso, I am also building an SP-10 plinth, so these considerations are very much on my mind, too. Ralph, I hope you get the picture.

So if I understand the utility of a good TT plinth is to damp vibrations as much as possible. Layers of different materials and added weight/size matters to achieve good damping. Nature of materials too.

I think Ralph has left the building. :)

The purpose of the plinth is to support the deck in a user friendly, high waf structure, and prevent unwanted vibrations (from inside or out) reaching the stylus. Use minimum 6 layers of 18mm ply or 30mm of slate. :)

Rgds

High waf structure ? You mean a nice design ?