Direct drive vs belt vs rim vs idler arm

Hi Lespier,
Very impressive results. Congratulations on your tt design. I am also amazed at the unfiltered results. Your test record is centered nearly perfect based on the extremely low Wow&Flutter results. Did you do anything special to your test record to center it? I think we all want to know how to do that.

Dear Ct, The copper mat cannot really "damage" the servo permanently. It's just that the servo is operating suboptimally. Excessive platter mass can only damage the bearing in the long run.

Henry, If you tell me how to do it, since the photos are on my desktop, not on the internet, I will post a photo of my "new" 1959 Alfa Romeo Giulietta Spider Veloce.

As you may know, I have owned (in the past) just about every model of 356, up to a Carrera GT Speedster, and finally a 550RS Spyder. But I have been bereft of old cars for more than 10 years, until now.

Lespier,

Your results for the tt101 are interesting but more telling (as you have multiple arms) would be to place the smaller feickert test disc on top of a (heavily modulated?) 12" lp and play the lp with one arm and the test disc with another. This will give us a picture of what's going on in real time under dynamic conditions.

That's exactly what I have done on my latest Posting which shows 4 photos for each turntable.
The last two photos of each....show the effect of another arm dropped midway onto 'heavily modulated' disc whilst the test tone is being played by another arm
Please read the descriptions beneath each photo?

Agree with Tony......very impressive results from your turntable. Congratulations.
Can you describe the motor and modifications you have made?

I am beginning to suspect the accuracy of the Feickert Platter Speed App and/or Adjust 7" Test Record?
As I mentioned previously......every time one does a test on the same turntable with the same arm and cartridge....slightly different results appear in the Data.
Additionally....as Tony has pointed out.....turning the disc 1/4 turn at a time will give differing results due to record eccentricity.
But the real problem as I see it....is that one can achieve far better results from a 10 sec-20 sec Test than with a 4 minute or 6 minute test?
Hmmm.......