Turntable speed accuracy

Albert, Will talk to Bill this week on that subject, I hope.

I guess there is not much juice left in this topic. Here's a tidbit. I noticed someone on Vinyl Asylum out up a URL for a new line of turntables, made by a company called "George Warren". It's really one belt-drive model that comes in several finishes. They use a Maxon motor, which is a high quality DC motor. Platter speed is monitored much like what Denon and Sony did 30 years ago, by a sensor at the platter. Then corrective information is fed back to the motor via the controller. No mention of quartz referencing, but the concept fits in with what we have been talking about, DD technology used to stabilize speed of a BD turntable. Like someone else pointed out, using a DC motor, which needs it.

ΟΚ, but we have to decide about the correlation between motor's torque and platter's inertia, the amount of belt's grip or slippage, the speed, the distance and diameter of the pulley in correlation with the desired circumferance of contact around the platter, a magnetic, hydraulic or pneumatic preloaded break ... So many things to consider and we have to know precisely the correct values in order to cooperate and fulfill the purpose of correction at the time the platter asks for. As the motor commands the correction and the drug varies continuously, the transitional stages of the driveline must be zeroed, it seems that it is a critical point in every part that meets the criteria. A golden ratio for everything.

No argument here. It does use fishing line for a drive belt, which would have little elasticity, at least.

Albert, I know the engineer well who designed the mods for the SP10mk3.
Will be very interested to see your feedback. One point to consider, you may be better to get the bearing mod and review the impact before the electronics mods, or you will be unable to discern what has done what. You wont know whether the bearing or electronics mod is a positive or negative unless you do one step at a time.

Dover,

Considering the shipping risk and time needed to get in line at Music Technology I don't have that luxury. Should I be worried about the electronics mods?

The oil and paper is the only change since my MK3 has already had every possible electronic part and adjustment performed long ago and I'm completely familiar with the sound of that.

I'm skipping the lead block mod on the bearing well. I'm nervous about the sound of lead plus I have my version of that as damping rod and block on my Panzerholz plinth.

That leaves only the oil and paper mods I think. Bill says they are harmless electrically and only provide damping. Do you have any listening experience with these mods?