2. analog
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LP12- Power Supply- Need education

I have read a lot about different options to upgrade the analogue power supply.
A phono stage need to amplify micro signal would require very good power supply to ensure there is minimal noise interfere with the signal.
I read about Lingo and other power supply articles, however they never mentioned about the science behind it.
How could a power supply powering a motor will introduce noise to the cartridge especially belt drive?
How do you measure the noise when playing a record?
Or would  the power supply provide a more stable rotational speed, my speed measurement on the turntable shows very consistence rpm once it is playing?
I really do not understand why a Lingo power supply cost so much but cannot provide an improvement with a measurable results.
Could someone educate me.
msnpassion
mijostyn's avatar
mijostyn
8,570 posts
 
Lewm, I have never had any speed issues with my SOTAs, not near as bad as tonearms bouncing off into space with the LP 12. But in case you are skeptical the new SOTAs have DC motors with microprocessor control. 
Daveyf, anybody who prefers a fixed table over a properly suspended one does not spend much time listening to vinyl. Unipivot tone arms are made by manufacturers who want to increase their profit margin. The newer Graham arms might be an exception. But even Graham had to resort to all kinds of magnetic wizardry to make it work. No anti skating? That should tell you something in and of itself. The last LP 12 I had was sold in 1980 for an Oracle another table that had much to be desired. I have not played with a recent one
  
mijostyn's avatar
mijostyn
8,570 posts
 
Oh and Daveyf I have SOTA Cosmos with a Kuzma 4 point 9 on it as well as an SME 30/12 with a 4 point 11 along with a multitude of cartridges. 
If I can save someone the misery of buying an LP 12, even a used one I am a happy guy. You are better off buying a Rega or Project. At least you don't have to worry about your tonearm bouncing off into the ozone. There is no way to set up an LP 12 correctly. It is hopeless from the start which is why so many people have to invent up grades to it hoping that somehow they will be able to make it work right?? Give up. It is not worth the heart burn. Get yourself a Victrola. Play some old 78s. 
daveyf's avatar
daveyf
3,076 posts
 
@mijostyn,    Since you just posted that the last time you owned an LP12 was in 1980...I think that tells us all we need to know. 
“There is no way to set up a LP12 correctly”...i’m sure back in 1980 that was your experience. LMAO.


”I have not played with a recent one”....but that doesn’t stop you from bringing us your two cents worth...right!
Quit being a troll and go to another thread.
lewm
13,732 posts
 
Mijo, With due respect, I think the old problem with the SOTA Sapphire was that the motor was mounted on a stationary platform while the platter, of course, was suspended.  When the suspension was activated, that caused the belt to stretch and contract in time with the bounce.  This resulted inevitably in speed instability that was quite noticeable.  In fairness to SOTA, I heard or read they solved that problem a while back.  DC motor would not be as good as their latest Eclipse option, the one that incorporates the PE technology, which works on AC synchronous.
bdp24's avatar
bdp24
10,258 posts
 

@lewm, lots of other tables have had their motors mounted on a stationary platform and their platters suspended: the Acoustic Research, Thorens 125/150/etc, Oracle, VPI HW-19, and of course the Linn Sondek itself. Did the old Sapphire have the slow-acting servo-control speed-correction that was clearly audible?

The new SOTA/Phoenix Engineering combination motor/power supply/tachometer is a dedicated, 3-phase DC motor design. Honest! SOTA is offering a version for use in VPI tables, the DC motor replacing the stock Hurst AC motor. PE’s Bill Carlin is adamant that a properly designed DC motor is far better than an AC: less noise and vibration, more torque and "drive".

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