Turntable speed accuracy

Hi Henry
I just re-read what you wrote. I am assuming when you say

“ In this.....a belt or thread drive is at a severe disadvantage”

that this is your opinion only.

Have you heard a string drive TT that was designed by its manufacturer for the use of string ?

Cheers Chris

Actually, since the Timeline is sitting on the spindle, and cannot fit completely over the spindle on a Lenco, which has a "fat"spindle, slippage of the LP would have no direct effect on the Timeline, in my particular report above. The Timeline is nowhere near to contacting the actual LP surface; it is kind of perched about 1 cm above it, which is as far down as it can go on the Lenco spindle.

Ct, Please say why you think there is anything of value to be learned by running without the Walker MC. I don't see the point, once I were to re-set the speed using the idler wheel adjustment. The Walker has no feedback mechanism; it only regenerates the AC used by the motor and controls motor speed by altering voltage. If anything, the WMC may reduce the torque of the single phase induction motor of the Lenco, because for this type of motor, voltage and torque are interdependent, within a limited range of adjustment.

Hi Lew - do u have a center weight with a flat top ? Bit of blue tac on the bottom of the Timeline and place it on top of it maybe? Yes that Lenco has a really fat spindle.

I am not familiar with the WMC - thanx for explanation. I have experimented with my SDS and my Lenco in the past - reason for my post. thx

Hi Chris,
My statement was directed at the 'speed' of any correction performed by the motor controller being felt by the platter?
I don't think there is any doubt that in a DD situation with the platter being attached to the motor......any speed correction will be effected faster than via a belt or thread connected to a motor/s at some distance from the platter?
If you re-read Peter Moncrief's excellent article that I posted several times........he provides a great deal of information regarding this very subject.

I'm not sure what the differences might be in a turntable designed for a string/thread drive over a belt?
Can you or someone provide some further thoughts on this subject?
Regards
Henry

Halcro, you have done a fantastic job bringing us up to speed on this and also leading the way on trying alternative ideas on your Raven. However I must pull you up on a couple of comments on DD
"The differences between the two drive types I believe, has to do more with the speed of any correction applied once a deviation is detected?
In this.....a belt or thread drive is at a severe disadvantage.
The DD motor....usually with a lot more torque than that of a belt/thread drive....and being directly connected to the platter.....can correct deviations in micro-seconds theoretically inaudible to the human ear."
Thread drives do not self correct as DD's do.
Didn't your mother tell you 2 wrongs don't make a right ? You could argue a DD is twice as bad as a thread drive. One assumes if there is a time slippage and it is a one off why stuff the next few seconds of music trying to catch up ?
Then there is the correction of the correction when the DD overshoots on correction.... as my learned engineer tells me, nothing wrong with DD's they are only a little bit out all of the time.
"The DD motor....usually with a lot more torque than that of a belt/thread drive"
This is a presumption, I'm not sure it is correct. I'm not sure how many DD's could spin my 20kg plus platter up to speed in less than one revolution as does the AC motor on my thread drive.
But to balance the argument I still lust after an SP10mkIII for a second deck.