Is it the behaviour of the servo that you are seeing? In what way is its behaviour improved?
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Is it the behaviour of the servo that you are seeing? In what way is its behaviour improved?
mArk,
I have listened to other people talk about this in relation to other makes of TT
I have had the original new platter running on my test TT for some time now and have no problems. The motor drive on the SL1200 models, is essentially a three phase 12 pole coil system driving a 16 radial pole osotropic ferite magnet. The phasing is controlled by the eight-pole pulse gernerator which opperates on 3 coil pairs.
I have had no noticeable control problems, excepting that the big secret is the radial positioning of the pulse generator wrt the invisible! poles of the magnet. A clever piece of engineering by technis.
In fact the response can seemingly be tuned for maximum performance, by very careful adjustment of the pulse generator position. You can even make it go backwards quite happily!!!
The pulse generator is made by myself as they cannot be obtained separately, and preset onto the platter before testing and shipping.
The ferite magnet is simply swapped over to the new platter.
You will most certainly require my bearing, using any other would be a waste of money. The reason being is that is has a massive 8mm dia. Silicon Nitride ball as the support, running on a carbide pad in an oil bath.
but isn't the servo loop expecting to modulate a low mass/low inertia platter
Yes and no. I will need to check that when I get a prototype from Mike. It is adjustable anyway but what you don't get is the cogging that is measurable on most conventional AC and DC motors.
We may well refine still further the electronics at a later date. Not many after-market manufacturers can actually measure properly or at all using their own in house test gear. I can clearly see and measure the cogging of a certain belt drive turntable, this must subtly modulate the music being played.
With time an effort, the SL-1200 will morph into almost another entire identity, and that identity might well take on the rest of the World including £100K turntables?
Regards
Dave
Would Technics supply the raw motor assembly as an OEM product like they used to, or would they require orders of thousands to even consider it?
Oooh... I like the sound of that! :eyebrows:Quote:
With time an effort, the SL-1200 will morph into almost another entire identity, and that identity might well take on the rest of the World including £100K turntables?
:respect:
Marco.