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  #11  
Old 03-13-2018, 08:50 AM
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Quote:
Originally Posted by vintage_tube View Post
It's a resonance/feedback issue in all likelihood -- maybe it was there before, but not as noticeable? You could always try a KAB RF1 Rumble/Subsonic Filter. If you can see the pumping, the KAB will in all likes solve it.

Best Sirs,

Bob
Thanks Bob ... I had read about that device and have been considering giving it a try ... two questions ... will that device in the loop degrade the overall sound? Also, I'm thinking that it would be better to solve the issue at the source if possible as any resonance I would think would have the potential to affect the level of detail and clarity that I'm able to retrieve as well wouldn't it?

Thanks

George
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  #12  
Old 03-13-2018, 09:13 AM
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Quote:
Originally Posted by gadawg View Post
Thanks Bob ... I had read about that device and have been considering giving it a try ... two questions ... will that device in the loop degrade the overall sound? Also, I'm thinking that it would be better to solve the issue at the source if possible as any resonance I would think would have the potential to affect the level of detail and clarity that I'm able to retrieve as well wouldn't it?

Thanks

George
Ideally solving the problem would be the better alternative than adding the KAB filter. Sometimes though, it's like chasing a hum problem & the woofer pumping is tasking your amp. So, what do you do?

The KAB is an active device (powered via a wallwart or similar), but understand it doesn't induce degradation of sound.

One trick I heard was of installing couple layers of felt or foam under the feet of the TT so there is no direct contact with the TT feet and the shelf it sits on. That's a rather inexpensive option to see if that clears the problem.

Good luck,

Best Sir,

Bob
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  #13  
Old 03-13-2018, 10:44 AM
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George -

Might be a good idea to post on the VPI site. They have some pretty knowledgeable VPI users. They have helped me in the past and I am also running a Prime with a Zephyr MIMC.

Most every time I have had an issue I did a "re-setup" and resolved them.

Good luck in solving the problem.
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  #14  
Old 03-14-2018, 11:32 AM
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This could be a drive system issue. If your Prime has a rim drive the driver wheel may be a bit out of round, even a wee bit not visible to the eye will cause what you hear. Or a belt that is out of round or worn in a particular spot. That can be why you only hear the noise on the first part of a record; the vibration dissapates as it goes further into the platter.
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  #15  
Old 03-14-2018, 01:27 PM
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It is belt drive so I'll try swapping out the belt. I'm also going to clean and lube the bearing this weekend to see if that helps. If nothing else works I'll likely try the KAB device Bob mentioned. Thanks guys!!

George
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  #16  
Old 03-14-2018, 02:13 PM
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I use a KAB RF-1 with my Aries 3x3 and it solved my rumble issue with no degradation of sound, at least to my 60 yo ears.
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  #17  
Old 03-14-2018, 03:24 PM
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Well mine are 52 years old so about the same! LOL

George
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  #18  
Old 03-16-2018, 03:37 AM
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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. The woofers are moving in sync with the rocking of the tonearm. Cleaned and lubed the bearing tonight and that didn't help. The headshell sites completely level when the record isn't moving but on the first track it just goes to rocking back and forth. Very strange! My new Levinson preamp does have a subsonic filter on the phono section so I'm using that for now and bypassing my ARC PH8 until I have a better solution.

George
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  #19  
Old 03-16-2018, 08:25 AM
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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!
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  #20  
Old 03-16-2018, 08:28 AM
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Quote:
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. The woofers are moving in sync with the rocking of the tonearm. Cleaned and lubed the bearing tonight and that didn't help. The headshell sites completely level when the record isn't moving but on the first track it just goes to rocking back and forth. Very strange! My new Levinson preamp does have a subsonic filter on the phono section so I'm using that for now and bypassing my ARC PH8 until I have a better solution.

George
Very strange indeed
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