Turntable speed accuracy

Halcro - welcome back. Australian politics has been very entertaining of late. Are you putting your hat in for Foreign Minister ?

Dover,

Good post, I agree there are many, many variables in this game of making a turntable, arm and cartridge right. The other variable is personal taste. I certainly have my prejudices.

Lespier

I'm more interested in how some touted belt drives(SME, Basis, Verdier, Micro Seiki etc) have fared when tested with the Timeline.

Perhaps the silence is telling us something.

We had some very interesting things show up with our Timeline tests.

I've read all the arguments about the Timeline only showing "that" one single revolution, and not what happens to the speed in between.

I get it, but if the laser is moving steadily along the wall in one direction and consistently it seems obvious that speed variation is a fact.

An even more bizarre thing happened some weeks ago during a test with the laser splashing on a wall about 18 feet away.

Anyone interested in duplicating what we did would be welcome. Just play an LP with fairly benign (soft) passage and note the laser position on the wall.

As the needle begins to enter the more difficult and complex musical passages note not only the position of the laser but it's actual "length" as it paints the light.

It finally occurred to us after some time what (I think) was happening. Would love to read reports from others including your conclusion if you do this experiment.

Albert
I'm guessing either the laser mark with the platter having slowed would take longer to traverse a section of wall (unlikely to have slowed enough to make a visible difference IMHO) or perhaps a high frequency flutter is causing the mark to appear longer.... very interesting anyway.

Dover
I should add that I have so far only used belt drive and a Garrad idler(which to me sounds less speed stable than my belt drive...something wrong with it???).
I'm starting to buy the argument for dd though so I may well travel down that path soon.

Halcro - welcome back. Australian politics has been very entertaining of late. Are you putting your hat in for Foreign Minister

Ha ha.....thanks Dover.
I don't think the Foreign Minister NOR Prime Minister will somehow pass the Timeline test??!
Really looking forward to your tests with the Timeline?

Hi Albert,
I have seen exactly that phenomenon with the Timeline on the Raven AC-2 driven by a slipping thread.
I know exactly what is happening and it is borne out by the laser mark AND the sound at the very same time.
The Timeline is its own reward :^)