Building plinths for quality DD tables?

Impulseh2, I have an early IOj and it does best in an Ikeda FR64x rather than a new Ikeda 407, OTOH my Denon 103R performs best in the Ikeda. I also great great results with the IO in an SMEV, but it is a bit fiddly to install. I might try it one day in my Triplanar VII, but not intuitive with the fixed wiring for both and having to use conectors.

The plinth shown on the above site is not a Kaneta plinth.
It is however beautifully made.

The Kaneta system for the SP10 involves discarding the whole chassis, power supply and mounting - just the motor and platter - in a fruit-wood plinth made from strips of wood (pear i seem to remember) which are glued alongside each other. There are 4/5 such layers each at 90 deg. to each other glued together vertically.

The PS is ditched in its entirety and a circuit designed by Kaneta is used as an outboard supply. This supply contains many now obsolete devices.

But as I have said above AP's work looks to be excellent and I would like to hear this alongside my own SP10 which has had the original PS boards taken off - chassis and mounted in an external-case connected by umbilical to the deck. It is in the original Technics obsidian (the solid version) plinth (as in my previous post) and the table sits on a sand-box. This treatment has lowered the noise floor to un-noticeable level....inky black in fact. The result is greatly enhanced dynamics, a MUCH more solid sound-stage with vast improvement in transparency and an altogether improved listening experience. This is most noticeable when listening to small scale classical music. The arm is a stripped to essentials Zeta rewired and an Audio Note Io from the first month of production.

I am confident that this set-up will outperform all but a very small number of TTs. I am seriously considering investing in a better arm and am unsure what to get...an Ikeda 12" appeals!

http://www.soundfountain.com/amb/sp10plinth.html

There's a guy named Albert Porter who has images of a very heavy plinth for his Technics SP10 MK2 posted at that site. Unknown if that's a benefit or not.

A direct drive motor's counter-torque is directly coupled into the chassis. This is an inevitable consequence of it being a direct drive, so it can't be avoided (unless you can work out how to suspend Newton's Third Law of Motion). Since a DD servo loop maintains constant speed by rapidly correcting the torque of the motor, the counter-torque must also exhibit these same variations.

I believe that DD designs are defined by how successfully they deal with this problem. The most original solution was Sansui's X99 with its counter-rotating platter but I've never actually seen one.

The most promising approach I have seen recently is Jonathan Weiss's custom cut slate plinth for the SP10.

Mark Kelly

I've had quite a few of these tables - all ex. BBC broadcast studios. They usually come from there mounted on ply motor boards which I guess are well less than an inch thick. They clearly sat into a desk. In this guise they sound awful...feedback may not be a problem as I suppose that they do not have large volume sound in the broadcast room itself and that the DJs wear earphones.

My experience is that the heavier a plinth the better. Google 'Kinyata SP10" and you will find the ultimate plinth. But, provided you remove the feet, the Technics obsidian plinths are petter than many think they are.