Turnable database with TimeLine

Make that DSLR. LOL

It gets better. I just found out that the video camera is a tape unit.

A promise is a promise, however.

Hi Harold,
Cool video. Very cool turntable and tonearm. I watched the video on my iPad and I could hear the WOW. I was supposed to be able to hear it, right? I think it was most pronounced when the stylus tracked over the wave in the record rather than the eccentric motion of the record; but hearing it in person would certainly be better. I think we all own a few records like that, unfortunately. Ironically, my test record is one that has an off center hole. So when I play the pure test tones, the WOW is very evident. The WOW caused by eccentric records is not so obvious to me when playing music- as long as the record is not too bad.

And thank you Halcro for that link. Much of what he wrote I already understood; but he gave me some insight into my Sota turntable. I can see his point about how the horizontal axis being unconstrained is a bad thing on a floating sub chassis. I can see how variations in stylus drag will change the belt load/tension which will cause the sub chassis to move in the horizontal direction. That movement, no matter how slight will alter the belt tension some more. Any change in belt tension will affect platter speed. It gave me some ideas. First, I'm going to fix the sub chassis with some rubber shims and see if I can hear a difference in the rhythm and pace. If I can, then I have an idea how I might constrain the horizontal axis without fixing the vertical axis.

Hi Tonywinsc,
I thought you might appreciate Peter's article if you hadn't read it before?
The impressive thing from my perspective....is that he wrote that article more than 10 years ago.....where visual proof of 'stylus drag' was unavailable....and most 'experts' were still confidently declaring that the sheer mass and momentum of most turntables could never be affected by the small forces of the stylus?!!
Yet Peter Moncrieff clearly declared 'stylus drag' as fact.....

Mosin.....a DSLR might sound tempting for making a video to upload to YouTube.....but a small hint.....an iPhone with direct upload is so much easier :-)

01-19-14: Peterayer
...If the result is truly as you describe, do you think Syntax would have posted the video for instant criticism?

Could you explain how you conclude that it is the effect of cogging from the same video evidence, especially since Syntax has explained that the effect on the dash line is different when actually observed by the naked eye?

I have taken about five videos of my turntable and the quality of the laser dash appears different in each one depending on lighting, camera angle to the laser dash, distance etc. It is clear to me that the video evidence with an iPhone is far from a perfect method and I think the Micro video was taken with a SLR still camera that also does video.

I did load my very first video at youtube now, the one in the darkness. That one is the one where I thought it is probably too bad from the quality for this Datbase, but here it is clearly to see, that the laser gets the mark in every rotation and another proof of the limit capability of my pocket camera (Canon IXUS) is seen when the Timeline spins and the laser sends the light in the rotation, when the camera get it, it is round of course, but not sharp round, a little bit like an egg from the color light.
Anyway, I saw the original Sutherland video, any video from your thread is easily on par with it. Even in the Sutherland video the length of the laser is not always equal in every rotation but after few revolutions it is always in the same area, too. You got it exactly right when you wrote about the camera recording ability. In reality it is even more clearly to see.

Micro Seiki RX5000 + HS80 Sutherland Timeline

I had a chance to experiment this evening. I used some rubber shims to constrain the sub chassis on my turntable in the horizontal axis. My Sota has the motor fixed on the main chassis while the tonearm and platter float on the sub chassis. First, I put on my test record to check speed with the iPhone app. Speed was 5 Hz high. So belt tension must have changed. I tried to keep the sub chassis in a neutral, level position. I adjusted speed and checked WoW & Flutter with the app. I saw right away that the FFT waveform is a clean sawtooth pattern now. Before the sawtooth pattern had a lot of hitches in it. I think this is already an improvement. Speed is within 0.025%. That is an order of magnitude higher than Peter's turntable; but pretty good I think, for an open loop motor. The timeline laser mark would move around 10X faster on my table than on some others. WoW & Flutter measured 0.02%/0.03%; typical.
Listening: First, I tried "For Duke". This is a technically near perfect direct to disc record and good music too. Rhythm and Pace seemed about the same to me. The bass seems cleaner and sharper. Should I expect that to be the case?
Next, I put on Beethoven's Appassionata. This is another direct to disc cut at 45 rpm. Sounded fantastic as always. Very powerful. I was hearing some micro detail that I had not heard from this record in years. eg. I could hear the pianist take in a breath just before hitting the keys. Would you expect to hear more detail? Again, I think the lower registers of the piano had more power.
I think overall it is an improvement. It was clearly seen on the iPhone app. So next step for me is to come up with a way to constrain the horizontal axis and leave the vertical axis free.