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In Reply to: Teres : "Direct Coupling ... a quantum leap in speed stability compared to traditional belt drive" posted by J.D. on August 1, 2007 at 11:34:41:
The cutting lathe that cut the lacquer most likely had speed fluctuations due to the drag of the cutting head during highly modulated passages. Unless your turntable also exhibits speed instability during these passages, the recording might not sound right.Producing a rock solid turntable in terms of speed stability seems like shooting yourself in the foot because the cutting lathe probably wasn't so stable. If it was, however, why not just build current "SOTA" turntables with drive mechanisms, bearings, and platters, similar to cutting lathes?
I mentioned this over on the Audiogon thread. It raised some eyebrows but got strangely quiet soon after.
link edited
Edits: 08/01/07
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Follow Ups
- Does speed stability even matter? - ketchup 18:26:28 08/01/07 (30)
- RE: I brought up "dynamic drag" at the cutter once before ... - Aleksunder 05:04:05 08/03/07 (0)
- Linn LP12/Lingo, Pioneer, Linn Axis measurements - Thomas_A 23:01:06 08/01/07 (0)
- Just try a belt drive before and after adding a speed control - powermatic 21:53:53 08/01/07 (7)
- exactly ... - TBone 22:29:12 08/01/07 (6)
- Yeah, but ... - Dave Pogue 07:53:16 08/02/07 (5)
- Thread Drive - Dave Garretson 08:26:36 08/02/07 (4)
- I didn't give up easily. - Dave Pogue 09:11:52 08/02/07 (3)
- RE: TNT Tweaks & Verus - Dave Garretson 10:53:41 08/02/07 (2)
- Well, one thing is clear. - Dave Pogue 11:20:16 08/02/07 (1)
- Indubitably - Dave Garretson 11:53:20 08/02/07 (0)
- RE: Good point - user510 19:34:09 08/01/07 (1)
- Hmmm... - anumber1 19:46:44 08/01/07 (0)
- braintwister ... not - J.D. 19:28:33 08/01/07 (2)
- RE: braintwister ... not - ketchup 21:09:38 08/01/07 (1)
- setting as goal : to match flaws = tail-chasing - J.D. 14:07:39 08/02/07 (0)
- To my ears yes - Mark Kelly 18:59:29 08/01/07 (7)
- RE: To my ears yes - ER 11:23:37 08/02/07 (3)
- Would you mind explaining how? (nt) - ketchup 15:47:52 08/02/07 (2)
- RE: Would you mind explaining how? (nt) - ER 13:16:34 08/03/07 (1)
- Thanks - ketchup 15:47:57 08/03/07 (0)
- RE: To my ears yes - ketchup 19:08:59 08/01/07 (2)
- You missed my point - Mark Kelly 19:29:57 08/01/07 (0)
- like a direct drive? [nt] - OMalley 19:13:36 08/01/07 (0)
- RE: Does speed stability even matter? - unclestu52 18:51:10 08/01/07 (6)
- RE: Does speed stability even matter? - ketchup 19:02:25 08/01/07 (5)
- RE: Does speed stability even matter? - unclestu52 00:45:21 08/02/07 (3)
- RE: Does speed stability even matter? - belyin 23:49:03 08/02/07 (1)
- No idea - unclestu52 02:26:49 08/05/07 (0)
- good post. thnx for research ... nt - J.D. 10:38:16 08/02/07 (0)
- which goes back to tape speed stability .... [nt] - OMalley 19:16:50 08/01/07 (0)