Turntable speed accuracy

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?

My point is that inertia has to be addressed at the outset of a turntable's design, and that electronic speed control merely augments it.

Mosin, as inertia is directly related to mass and friction.....are you saying that heavy platters have inherently greater inertia than light ones?
If you are?.........how do you explain that the turntable in the Timeline video features the Fat Bob platter with a massive weight and slows down alarmingly when the the stylus hits the record?
Yet my TT-101 has a puny 2.0 Kg cast aluminium platter which has zero deviation in speed with one, two or three cartridges lowered onto the same record?
All speed control is via the direct drive with servo control.
This instantaneous speed control I believe, is far more critical than inertia?

Henry - I want to see a youtube of the 3 cartridges lowered onto the record at the same time. :>)