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Lenco plinth? How big is too big?

I have an L78, upgraded Origin Live One arm, Empire MC-5 moving coil cartidge, and access to a sawmill with lots of prime cherry wood. I was thinking of a cherry plinth, 17 inches wide, 24 inches long, and six inches tall of cross layered one inch cherry. Then cut off the rear corner where the tone arm is mounted, in a sweeping arc of about 10 inch radius, and mount the tone arm on that detached corner. Use 1 inch thick isomolded graphite disks of 2 inch diameter topped by one 3/8" tungsten carbide ball, and resting on three such balls. Use three of these ball/disk combinations for each of the main plinth and the corner with the tone arm. What do y'all think? I would appreciate any suggestions before actually putting it all together. Thanks. Ralph
ralph1223
lewm
13,019 posts
 
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.
jloveys
226 posts
 
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.
bornin50
32 posts
 
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
jloveys
226 posts
 
High waf structure ? You mean a nice design ?
lewm
13,019 posts
 
I must have a particularly nice wife. Either that or she has a diminished esthetic sense. I've got three turntables sitting on the floor of our living room aka listening room, not to mention the one I use which is on the equipment shelf. And at the far end are the enormous Sound Lab ESLs flanked by huge and rather ugly OTL monoblocks. She never says a word, but she may be planning to kill me. No, in fact she's just a good egg.
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