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My personal experience with Direct Drive versus Belt Drive

This is my personal , yet limited experience, with a DD versus Belt Drive. This A/B took place in the same system. with literally the same tonearm. I am choosing not to mention brands at this point. I feel by keeping the brand out of the discussion, anyone who contributes to the the thread (myself included), can be a bit more forthcoming. I am not big on audiophile jargon, so I will keep this short and sweet. I started with DD, in a system which I was very familiar with. The room of course, was different. The DD struck me as near perfect. I could hear the starting and stopping on a dime, and the near perfect timing that many have associated with the DD.  It didn't take long at all for me to conclude this was not my cup of tea. It satisfied my brain, but didn't move my heart. Maybe I was used to the imperfect sound of belt drives, and it was indeed that imperfection, that made for an emotional experience. Who knows? (-: Fast forward to the belt drive.... Again, same actual arm. It sounded more analog to me. Decay was much more easy to hear, along with subtle spatial cues. Was it the less than perfect timing, that was allowing me to now hear these things I could not with the DD?  I have no clue! What I was sure about was the emotion of the music had returned.
fjn04
hiho
451 posts
 
Lewm: "if I was still interested in belt drive for my own use, would be two motors positioned at opposite sides of the platter, 180 degrees apart, so as to equalize the forces involved in rotating the platter through a belt connection."

I would simply placed another pulley next to the platter on the opposite side of the motor: one motor, one platter, and two pulleys. I think that would do the trick without the extra motor noise. VPI  did something similar in their early TNT model but with THREE pulleys!
ct0517's avatar
ct0517
2,041 posts
 
^^^^^
hiho - pulleys also make noise.

I owned one of these TNT turntables. A very nice table I used it with and without the extra pulleys. It was outperformed by my custom Technics Sp10 and also the Jean Nantais 100 lb Lenco. Then I modified the TNT, including the use of thread. At this point it outperformed the Technics and the Jean Nantais lenco and produced music as described in my previous post - words courtesy of SG. 8^0
analogluvr
859 posts
 
Chris I tried looking up your thread "goldilocks and the three turntables " but couldn't find it.  Could you provide a link?  
Also, off topic I apologize, but how do you contact a member directly in this system?
lewm
12,858 posts
 
Harold, You never mentioned, until lately, that your rim drive is a Salvation.  Vic's seems to be the best, by visual inspection of photographs, of the bunch.  At least in part, I think this is because he started out from the beginning to design and build a rim drive, whereas most of the others out there are belt-drive conversions.  Too bad that TT Weights went out of business; some of their offerings also seem to have been born as rim drive.  However, apparently they had problems. (Please don't attack me on that; I am only reiterating what I've read here and on VA.)

Hiho, Your solution might work well too.  However, I'd have to think about how the second (passive) pulley would affect belt creep.  Three pulleys, like 3 motors, is just a commercial gimmick with mostly negative consequences, IMO.

pbnaudio's avatar
pbnaudio
1,613 posts
 
As far as how important speed stability is for a turntable please consider this.  I have done a lot of experimenting with belt drives using mostly parts form VPI but others too.  When adding more belts to a VPI drive, on the two motor drive station with the flywheel its possible to have a total of 4 a noticeable improvement is sound quality is obtained with 4 belts as opposed to just one, presumably because of less belt creep. Also when adding the SDS speed control which basically is a frequency converter supplying a very steady sine wave to the motor(s) a very noticeable improvement is sound quality is also obtained.  

A properly restored DD table from 70 - 80s is incredibly speed accurate any timeline test - or Roadrunner Tachometer test easily shows this and to me presents the music with a pace and energy that I have not heard from any belt drive.

Analogluvr  sent you a message explaining how to send a message on this forum.

Good Listening


Peter
 
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