Turn table speed variation question
I do believe the word unequalled may be a contentious one.Perhaps I should have elaborated .but this has been discussed in other Threads on turntable speed accuracy and I did not wish to complicate this one? The JVC/Victor TT-101 has pretty good specs . Wow and Flutter- within 0.02% WRMS Speed deviation- 0.002% Load characteristics- 0% (with a 120g total tracking force) Drift- 0.0004% But to me .printed specifications are meaningless when it comes to actual performance in relation to speed accuracy and consistency? Until recently the concept of stylus drag on the speed performance of a turntable was treated with scepticism. Then Ron Sutherland introduced the Timeline .a laser-flashing puck which sits over the turntable spindle and has a time-base accuracy of 2 parts per million. With this device installed ..it provided scientific evidence of the phenomenon of stylus drag as the laser spot was seen to drift the moment the cartridge hit the record with most turntables .especially belt-drive ones. The very best belt-drive turntables have reportedly been able to maintain the stability of the laser dot of the Timeline ..when the speed has been adjusted with the cartridge already tracking the record. But then it is out of adjustment when no record is being tracked? I have not witnessed any visual evidence of these accomplishments ..they are merely empirical claims. I have not seen nor heard of any claims regarding the speed accuracy of Idler or Rim Drive turntables using the Timeline under stylus drag conditions. I have tested the TT-101 under all conditions ..with and without stylus drag .and the laser dot of the Timeline does not deviate. TT-101 This test has not been reproduced successfully with 3 arms and cartridges on and off ..with any other turntable to my knowledge? Hence my statement? If your turntable can match this performance ..please upload the evidence to YouTube and I will revise my statement to equalled but not exceeded :-) |
[/quote] 12-19-13: HalcroHalcro - you are ready for the next big upgrade...... Nakamichi TX1000 - direct drive and self centering for eccentric records - perfect sound forever, almost as good as digital. Using high compliance cartridges on heavy arms will exacerbate the problems of eccentric records as well. |
When you have these wow/flutters variations in your turntable is time to update some points in your system. I also recommend you a tool similar to Dr Feickert platter speed program and Adjust+ LP to check changes on values. I usually improve these values taking care a lot the belts. You should move your non direct drive turntable everyday to avoid any kind of belt deform. You also need to re-oil your turntable bearing. If yo have an AC motor you need a good frequency generator to control Hz fluctuations. If you have DC there is nothing to do. Indeed you can buy an outer ring to improve the moment of inertia, trackability and effective platter mass. All of these points are interesting if you are a vinyl lover |
