Hi Hamish,

I think the simple answer for anyone wanting to know the answer to this is just to phone dave! As I said before he was more than forthcoming with the answers but doesn't really want to speak on forums any more!
Remember what I wrote earlier:

Therefore some documented measurements, showing the speed stability of the drive system using the stock platter (powered by the standard Timestep PSU) before, and then after the new platter and HE PSU mods have been installed, would be useful - and that's where Dave comes in.

W&F figures (before and after) using a series of chosen test records, played and analysed over and extended period of time, would be useful.
How can I examine the above evidence in a phone call?

Before I'd consider buying the new platter, I'll need to see some documented measurements, confirming the above, on a screen in front of me, so that Anthony, for example, can confirm that they irrefutably dismiss our concerns. Dave, apparently, has the necessary test equipment, and has been working on this, so therefore when he's finished there's nothing to stop him from supplying the relevant measurements either here or on his website.

The jist for anyone loosly interested (without wanting to be a spokesperson for dave as such) is that even with a mass far in excess of the new platter, the motor has no issue spinning up to speed in a very short amout of time. As well as that once spinning it provides no extra strain on the motor over the normal platter.... That's at least how I understood it anyway...
That's not what we're getting at, dude.... Read what Anthony wrote again:

How will the new heavier platter affect the motor and therefore its control circuitry's ability to cope and still be able to adjust and change "INSTANTLY" to the very small but infinite changes needed to counteract the ever-varying different and complex loading that is a fact of needle and record groove contact?
The key word there is "instantly".

If there's even the tiniest, minutest deviation in the drive system's ability to maintain correct speed during playback (causing it to 'hunt' as the control circuitry attempts to lock the correct the speed), this will immediately be detected by the stylus and translated to our ears as a perceived 'slowing down' of the music, leading to timing and pitch problems and the diluting of leading-edge definition.

In short, we'd eventually find ourselves disinterested when listening to music because the sound would be robbed of 'life'.

We need some objective evidence which shows that, when the new platter and HE PSU are fitted, the drive system will be able to maintain the correct speed as accurately as it currently does with the stock platter. When that's confirmed, we can then enjoy the sonic benefits of the new platter in terms of it being more rigid and less resonant.

Do you see what I'm getting at?

I don't want any compromises or trade-offs with this modification - only undisputable all-round improvements!

Marco.

P.S Giovanni, this reply is also directed at you.