Turntable speed accuracy

Tonywinsc,
interesting what you experienced during your test measurements. on all my TTs I experience a change in speed when the needle hits the record. Regarding the different carts and weights of the headshells I usually adjust speed by my speed controllers. Belt drive not necessarily needs to be a disadvantage (thread). I usually measure my wow & flutter with a test tone of 3150 Hz and on the EMT by 5000 Hz (J60s).

You are so right on the Influence of the exact spindle position of the record. Most turntable designs don't refer to this issue. I know one design which does optimise the center of rotation - the Nakamichi TX 1000.

Best @ Fun Only

Tonywinsc -- excellent post!

I was thinking of the Nak TX 1000 as I contemplated your thoughts...Thuchan knows a thing or two -- about audio, I mean, hehe :-)

It would be fascinating to run those tests with the TX 1000 as the DUT.

Best regards,
Sam

on all my TTs I experience a change in speed when the needle hits the record.

Thuchan,
On my TT-101 there is zero speed change when the cartridge hits the record. Even with the low compliance heavy tracking XV-1s and FR-7f.

Halcro,

do you have an inbuilt realigning control unit which brings the speed always to 33 or 45?

best @ fun only

Dear Thuchan,
The Victor TT-101 is quartz controlled direct drive and automatically runs at a true 33.3rpm or 45rpm.
It has pitch adjustment in 6hz increments in both positive and negative direction.....but I never use this feature.
The servo control is bi-lateral........it works to speed up AND slow down.
Most other servos only are capable of speeding up and then rely on natural friction (or stylus drag) to be detected as 'too slow'.......for it to 'then 'speed up'.
This natural time delay is too slow with too much speed variance to really be critically effective IMHO?
Do you notice this slow-down when the stylus lands.........on your Nakamichi as well as your belt drives?