Interesting this inertia talk.
That raises the (old?) question who should control the STEADYNESS of speed - inertia of the platter, or the motor AND IT'S CONTROLLER.
If the motor sux, or the controller sux, you have to look back to the platter's inertia. If you manage to make it THAT heavy (never mind the resulting bearing problems) there must come a point where any conceivable variation in friction-changes of the needle to vinyl interface become SO SMALL as to approach zero.
I have a notion we have to look for some mighty heavy platter to get there. One expert put two Micro-Seiki on top of each other --- and then waits 5 minutes for the darn thing to stabilize the speed.
You see, we are now starting to move big-time out of the practical useful user-application --- which in turn also sux.
So it's back to the more practical idea as was mentioned above platter-weight not much more then ~ 4.5kg, still using a belt for a tiny bit more forgivingness, than a DD which translates its little faults too immediate into the speed stability.
Lastly a motor / controller package with the best available feedback speed / loop to mankind :-)
A thing to note: that bearing friction has to be present at a controlled level to "damp" the controller feed-back loop, preventing feed-back resonance, so to speak.
Now have a look who is doing something like this, and I guess you'd have a 'best of breed' and still user friendly tt.
Greetings,
That raises the (old?) question who should control the STEADYNESS of speed - inertia of the platter, or the motor AND IT'S CONTROLLER.
If the motor sux, or the controller sux, you have to look back to the platter's inertia. If you manage to make it THAT heavy (never mind the resulting bearing problems) there must come a point where any conceivable variation in friction-changes of the needle to vinyl interface become SO SMALL as to approach zero.
I have a notion we have to look for some mighty heavy platter to get there. One expert put two Micro-Seiki on top of each other --- and then waits 5 minutes for the darn thing to stabilize the speed.
You see, we are now starting to move big-time out of the practical useful user-application --- which in turn also sux.
So it's back to the more practical idea as was mentioned above platter-weight not much more then ~ 4.5kg, still using a belt for a tiny bit more forgivingness, than a DD which translates its little faults too immediate into the speed stability.
Lastly a motor / controller package with the best available feedback speed / loop to mankind :-)
A thing to note: that bearing friction has to be present at a controlled level to "damp" the controller feed-back loop, preventing feed-back resonance, so to speak.
Now have a look who is doing something like this, and I guess you'd have a 'best of breed' and still user friendly tt.
Greetings,