A Copernican View of the Turntable System

Jcarr,

I appreciate your comments as usual and recognise the logic (indeed a Japanese technician who used to produce tonearms in the 80s has pressed the same logic on me for some time) but can only say that my experience of isolated tonearm and turntable does not accord with the theory. Whatever the reason, the results really do speak for themselves.

Lewm,

Thanks and its machinability and aesthetics are key reasons why I am considering using brass for my arm towers. This will be important as I intend to do all the work myself. The other reasons are its relative price to bronze and its decent mass.

Now I just need the time and opportunity to try this out

Lewm,

Thanks and its machinability and aesthetics are key reasons why I am considering using brass for my arm towers. This will be important as I intend to do all the work myself. The other reasons are its price relative to bronze, its decent mass and of course its not being magnetic.

Now I just need the time and opportunity to try this out

T-bone, thanks for your helpful comments. if the plastic piece does not link the arm pod with the TT what kind of material will do it? I always use isolation platforms: the TOHO stand is placed on one, the motor on a separate one, the turntable on three isolated feet with platforms and the whole system again on a special Copulare isolation table (platform structure as well as feet).Following JC's suggestion to shield the TT i should build a surrounding shield for allover wave protection around the Continuum. This I can do. What is the best material and how much of the turntable needs to be covered, 100 mm above the highest point (tonearm)?

best & fun only

Thuchan,
This is, as Dgob points out, only theory. However, following that theory, one would say that having armpod and turntable on different isolation platforms would be sub-optimal. One could see this by having the table be absolutely, perfectly stable and putting the arm pod on top of a sponge-y material - the arm-mount/arm bearing is isolated/coupled to a different extent than the table bearing. Any movement anywhere (the ones your isolation platform is supposed to counteract) will lead to distortion because of the mismatch in response of the bearing surfaces. Putting both on separate isolation platforms does not necessarily improve things as trying to match the resonant frequencies of the two isolation platforms in both frequency AND phase is almost impossible (primarily due to differences in platform loading leading to both different frequency and different reaction time to a given impulse). Or so the theory goes...