RE: Any rec's for a third party, free-standing turntable motor?

Posted by flood2 (A) on January 20, 2022 at 23:00:35

In Reply to: Any rec's for a third party, free-standing turntable motor? posted by ppopp on January 20, 2022 at 13:44:08:

I wouldn't be rushing out to buy a new motor until you've checked through everything else first. I'm with Pete on this in that the typical wow levels of a good drive system are not going to be seen with a strobe unless there is a serious mechanical problem .
If you don't have a test disc and suitable equipment to record the test tone or analyse the signal in real time, you can download an app to your smartphone - there are apps for both iOS (RPM) and Android (RPM Speed & Wow). These will use the internal sensors of your phone and estimate the peak to peak wow and flutter levels. You need to use them with care - place the phone such that the centre of mass is over the spindle and you should get accurate results. You won't be able to make a direct comparison to the spec of the turntable because the averaging and weighting is according to different standards, but you can get the waveform, see the peak to peak wow and the speed error all from a free app.

If you are hearing audible flutter or wow, then the other thing to check is if the record you are playing is correctly centred - very often the holes are off centre.
Also if the cartridge is not an ideal compliance to the effective mass of the arm, then the LF resonance (which modulates your recovered signal) can cause audible wobbles in the sound.
If the compliance is too low such that the LF resonance is near the bottom of the audible range then you will hear what sounds like flutter. If the compliance is too high and the cartridge is visibly jittering up and down then you will what sounds a bit like wow.
If the mechanical match of the cartridge is fine, and the app shows that your deck is running smoothly, then it may be that you are just very sensitive and need to consider a direct drive instead like an SP10R! A new motor is unlikely to change things without a special waveform synthesised drive signal and special power supply for the motor. The original Linn Lingo did just that and made some useful improvements to the basic LP12.
Regards Anthony

"Beauty is Truth, Truth Beauty.." Keats

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Follow Ups Full Thread

Topic - Any rec's for a third party, free-standing turntable motor? - ppopp 13:44:08 01/20/22 (15)

RE: Any rec's for a third party, free-standing turntable motor? - flood2 23:00:35 01/20/22 (0)

RE: Any rec's for a third party, free-standing turntable motor? - PAR 16:40:28 01/20/22 (4)

RE: Any rec's for a third party, free-standing turntable motor? - ppopp 19:54:37 01/20/22 (3)

I have seen that too on a high end belt-driven turntable - B.K. 20:53:15 01/21/22 (0)

RE: Any rec's for a third party, free-standing turntable motor? - PAR 02:05:12 01/21/22 (1)

Of all the unlikely cures.. Holy expletive! - ppopp 17:38:40 01/23/22 (0)

Here's what I recommend.... - John Elison 14:29:57 01/20/22 (1)

RE: Here's what I recommend.... - ChesshireCat 20:31:04 01/20/22 (0)

RE: Any rec's for a third party, free-standing turntable motor? - ChesshireCat 14:27:14 01/20/22 (0)

The Dereneville looks very promising. Link. - viridian 14:13:43 01/20/22 (5)

RE: The Dereneville looks very promising. Link. - ChesshireCat 20:25:52 01/20/22 (4)

RE: The Dereneville looks very promising. Link. - Pyramid 06:15:25 01/22/22 (0)

You are comparing a DIY solution to a finished product. - viridian 23:01:49 01/20/22 (2)

RE: You are comparing a DIY solution to a finished product. - ChesshireCat 14:55:48 01/21/22 (1)

The audio hobby is full of arcane technologies that people prefer...- - viridian 19:01:56 01/21/22 (0)

Follow Ups

RE: Any rec's for a third party, free-standing turntable motor? - flood2 23:00:35 01/20/22 (0)

RE: Any rec's for a third party, free-standing turntable motor?

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