SL1210 Platter 'wobble'

[Mike_New]

Marco,
My objective is to produce a platter that really complements the potential of the direct drive system, and has far greater sonic qualities than the very inadequate standard offering.

I am machining the platters from quality aerospace aluminium, which in itself is not imune from ringing, however because the platter is machined from a solid blank It is expected that the resonant energy will be low. Also there are five brass inserts which are a shrink fit into the platter, these are designed to absorb and counteract resonance. There will be a groove machine under the main 300mm dia, of the platter for lifting purposes.

I have attempted to get some weight below the spindle support but this is controlled by the existing components on the circuit board which would appear to vary between models.
The new platter presumes the use of an external PS, the exisiting transformer and wiring will need to be removed and the top cover can no longer be used as it obstucts the lower part of the platter.
I guess this platter represents something of a radical departure from the norm. Dave will shortly be getting the first production unit for sonic evaluation using his test equipment.