Direct drive vs belt vs rim vs idler arm

Dover
With the many faults of analogue playback I'm guessing there would be few on these forums including those in the audio press that would debate stylus drag as a principal fault, but maybe I'm wrong.
Speaking for myself I think this is why experimenting with some vintage direct drives has started me on a better path to enjoying more from my records then ever before and at a fraction of the cost of my previous belt drive tables.

More on serious faults as you are well aware, another speed instability problem that grossly effects pitch is off centre spindle and worn holes which effects pretty much every record causing velocity changes.

:pitch rules:

These new fancy tables of today ,that is, the ones you would take a mortgage out on,.Do any of these new age designers tackled this problem. The wow from a off centre record can be significant, worst then a warped record.

A while ago one of these table manufactures put up a dramatic test on youtube I think, featuring several people rapping on the platform of his $150,000.00 ,less arm, table while it played! Anyone here ever witness Mich Cotter in one of his demonstration's doing basically the same thing............ 30 years ago.

Finally for those with a LO7D that want to use a Time line,you can easily fabricate a disk to fit over the spindle of the table and set in a second spindle that fits the hole of the timeline.

Good read guy's, as some here are well aware off centre record holes including test recrds are problematic especially for us that are sensitive to variations of pitch and are acutely aware of it. With a off centre spindle hole,as the stylus traverse through the grooves changes in velocity occur which of coarse with change pitch , low in the beginning of the Lp to high as the stylus traverse toward the label, then add this to a table that can't keep speed when the needle is in the groove.

Anyone remember a product offered in the 1980s called centre a disk?
Dover you notice a positive difference correcting your off centre records right? However doing this by eye is near impossible.
You can make a geometry jig, two intersecting diameters of a circle where the two diameter lines cross.
What it is are perpendicular "frame" called chords to form legs of a right triangle. A third side of the triangle is the diameter. A diameter is a line that passes throgh the centre of the circle and two diameters must cross at the centre.
Visualize a rectangular box shape with cross hairs,I used two pound fishing line as the diameters or cross hairs, practice on worthless vinyl.
It works very well however I would like to see something better. Halcro this could be a good project for you.

Dover recently I had a demonstration of a Nakamichi 1000 table and was impressed, I just got caught up in the hoopla about it thats all,I should read this site more and I'll shut up .I know a reference position is needed of course to use a centre correcting jig and much more work can be done on my attempts.
Mosin I agree with Lewm on the issue of direct drives, Halcros nude thread on plinth-less dd is a shining example of the influence poor plinth design and material used can directly effect performance. On the other side of the coin is the plinth of the fantastic Kenwood L07D.

lewm I became aware of some sort of vail with three examples of the Sp10mk2. For a lack of a better discription I found it similar to that of flutter that seam to be consistently fixed into the upper top frequency's.