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VPI Industries Turntables Made in USA

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  #21  
Old 03-16-2018, 11:19 AM
dolsey01 dolsey01 is offline
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Originally Posted by audio bill View Post
George - VPI offers an arm modification called the Dual Pivot adapter which provides an additional pivot point and eliminates arm wobble. Many users have reported improved sound as well from having a more stable arm. I don't see it listed on VPI's site but it's available from their dealers and is a relatively easy installation. Cost is $150 and Ivan should be able to get it for you. This should resolve your problem at a nominal cost!
In my case, the dual pivot did not make a difference but I haven't noticed any arm wobble.
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  #22  
Old 03-16-2018, 12:59 PM
gadawg gadawg is offline
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Originally Posted by joey_v View Post
Very strange indeed
Very strange indeed in that it only wobbles on the first bit of the record. I'm going to completely redo the setup this weekend and see where that gets me. I will most likely add the dual pivot mod as well.

George
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  #23  
Old 03-16-2018, 04:11 PM
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Record warp is generally most significant towards the outer edge of an LP, and that can cause such wobble in undamped unipivot tonearms. Periphery record clamps are another potential solution in helping to flatten out such warps and to minimize arm wobble they can cause.
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  #24  
Old 03-16-2018, 04:12 PM
cleeds cleeds is offline
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Originally Posted by gadawg View Post
Update ... figured out at least what the problem is. On the early part of the record the arm is rocking back and forth from an Azimuth standpoint. By the second track it gets stable ...
That's great that you found the root cause of the problem. Your tale just reinforces my prejudice against unipivot arms, though - even though I've heard them perform extremely well in some systems.
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  #25  
Old 03-16-2018, 10:10 PM
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Originally Posted by audio bill View Post
Record warp is generally most significant towards the outer edge of an LP, and that can cause such wobble in undamped unipivot tonearms. Periphery record clamps are another potential solution in helping to flatten out such warps and to minimize arm wobble they can cause.
Except that these records aren't warped and it does it on every single record I own which played fine until recently. I'm going with some sort of setup issue and will update the thread once I've redone the setup again. Wish me luck!
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  #26  
Old 03-17-2018, 03:33 AM
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Good luck. I know how hard some turntable setup problems can be...
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  #27  
Old 03-17-2018, 08:00 AM
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Of course I wish you the best of luck, that goes without saying! I assume you're using the standard screw down clamp with the black washer that come with the VPI Prime table. With that setup you should only tighten the clamp until it's snug but not overly tight. You can experiment with that to see if it affects the wobble, since over tightening it can cause the outer edge of the LP to dish a bit which can cause some wobble.
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  #28  
Old 03-18-2018, 12:59 AM
gadawg gadawg is offline
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Problem solved .... one of the prime feet weren’t completely tight at the base so there was a tad bit of play so as the heavy platter would spin it caused some very tiny movement of the base which was worse at the edge of the record ... which caused the arm to wobble excessively causing the rumble. Now my only problem is that I auditioned the Avenger Reference with the Transfiguration Proteus today and am having delusions of grandeur now! LOL

Last edited by gadawg; 03-18-2018 at 02:25 AM.
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  #29  
Old 03-18-2018, 01:16 AM
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Excellent news, it’s great when these things turn out to be a simple fix. But don’t let that hold you back, let your delusion become your reality.
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  #30  
Old 03-18-2018, 08:53 AM
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Quote:
Originally Posted by gadawg View Post
Problem solved .... one of the prime feet weren’t completely tight at the base so there was a tad bit of play so as the heavy platter would spin it caused some very tiny movement of the base which was worse at the edge of the record ... which caused the arm to wobble excessively causing the rumble. Now my only problem is that I auditioned the Avenger Reference with the Transfiguration Proteus today and am having delusions of grandeur now! LOL
I'm so glad that you were able to solve the problem, and have to admit I never would have suspected a loose foot to be the root cause!
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