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 Post subject: turntable platter wobble
PostPosted: Sat Jul 22, 2017 5:41 am 
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Location: scarborough, ON, CA
I have a new (bought in January) rega rp6.
Last night I noticed there is a wobble (like playing an album that isn't perfectly flat) coming from the platter.
I removed the mat and put a level on the glass platter, it is pretty much nuts on.
There is no doubt, as the platter spins it has a wobble.
I lifted the platter out and rotated it, now I had to re-level the platter, which I did.
Still a wobble. I think the glass platter may not be true.
It's not a huge movement, it wouldn't cause the needle to jump, but it is there, noticeable.
Is this common with Regas, or all tt's?
Am I hand wringing?


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PostPosted: Sat Jul 22, 2017 6:10 am 
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I have a P3, and it doesn't wobble. It should be easy to determine if the platter is true by using a straight-edge over the diameter of the top and bottom, in a few places.

It sounds more likely that the sub-platter, shaft or bearing is the problem. If you remove the glass platter, does the sub-platter wobble when it spins without the platter on it?

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PostPosted: Sat Jul 22, 2017 6:27 am 
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I have a Rega planar P3 and the platter runs true. You probably already have but check the mating surfaces for any slight damage or foreign particles .


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PostPosted: Sat Jul 22, 2017 6:31 am 
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If you bought it from a local dealer, take it in for a look see or replacement. They can probably swap platter and subplatter from a demo unit and quickly identify the source.

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PostPosted: Sat Jul 22, 2017 6:47 am 
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The glass will not distort unless you're putting it in an oven at ~580 degrees C, so as suggested you need to look further.

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PostPosted: Sat Jul 22, 2017 7:16 am 
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Is it audible?

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PostPosted: Sat Jul 22, 2017 8:03 am 
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Long time Rega user here. I have owned the P1, Planar 2 and P5.

Rega can be a bit quirky and quality control in manufacturing is not in the Linn or B&W class but the products are very durable.

What you might be seeing is a manufacturing defect in the very slightly beveled edge of the platter. It is probably a bit uneven. The top (LP surface) is likely true and flat so you notice it with the LP and felt mat in place more.

Glass is hard to machine and Rega builds a lot of these. Even with great tool and die maintenance, it is hard to make sure this slight bevel is dead nuts. It does not affect sound. My P5 was the same way. I noticed it because of how perfect my Linn platters (LP12 and Axis) always were. There is a reason glass is not widely used for platters.


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PostPosted: Sat Jul 22, 2017 8:30 am 
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banerjba wrote:
Long time Rega user here. I have owned the P1, Planar 2 and P5.

Rega can be a bit quirky and quality control in manufacturing is not in the Linn or B&W class but the products are very durable.

What you might be seeing is a manufacturing defect in the very slightly beveled edge of the platter. It is probably a bit uneven. The top (LP surface) is likely true and flat so you notice it with the LP and felt mat in place more.

Glass is hard to machine and Rega builds a lot of these. Even with great tool and die maintenance, it is hard to make sure this slight bevel is dead nuts. It does not affect sound. My P5 was the same way. I noticed it because of how perfect my Linn platters (LP12 and Axis) always were. There is a reason glass is not widely used for platters.

I never understood the logic behind glass platters....
Wouldn't it ring like a mother??


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PostPosted: Sat Jul 22, 2017 8:43 am 
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Hi

Had the same on an RP1. Changed sub and platter and wobble left the premises.

Sold the sub and the platter left with the recycling bin.

Could have argued with the local shop, waiting and waiting, prefered upgrading rather than arguing.

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PostPosted: Sat Jul 22, 2017 9:27 am 
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analogluvr wrote:
I never understood the logic behind glass platters....
Wouldn't it ring like a mother??
Indeed, that's why its use is frowned upon for equipment racks....imagine what placing a record on it does. The RP6 is laminated though, I believe, which should null the ringing.

As others have suggested, the fault is more likely in the bearing or subplatter and where they join. Float glass has the advantage of being very flat.

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PostPosted: Sat Jul 22, 2017 10:21 am 
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ripblade wrote:
analogluvr wrote:
I never understood the logic behind glass platters....
Wouldn't it ring like a mother??
Indeed, that's why its use is frowned upon for equipment racks....imagine what placing a record on it does. The RP6 is laminated though, I believe, which should null the ringing.

As others have suggested, the fault is more likely in the bearing or subplatter and where they join. Float glass has the advantage of being very flat.

There is also the thickness, shape to surface area to consider. A thin, rectangular piece of glass is sure to ring with its unequal proportiona, a much thicker, round (therefore better distributed internal stresses) piece of float glass won't ring anywhere near as much; if at all at audible frequencies. Think of a brass cymbal versus a 2" brass spike/cylinder used for vibration control. Same material, absolute opposite use and results. IMO, condemning the material without understanding the science is just plain stupid.


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PostPosted: Sat Jul 22, 2017 10:39 am 
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OBI56 wrote:
ripblade wrote:
analogluvr wrote:
I never understood the logic behind glass platters....
Wouldn't it ring like a mother??
Indeed, that's why its use is frowned upon for equipment racks....imagine what placing a record on it does. The RP6 is laminated though, I believe, which should null the ringing.

As others have suggested, the fault is more likely in the bearing or subplatter and where they join. Float glass has the advantage of being very flat.


... condemning the material without understanding the science is just plain stupid.


Ding, ding, ding, ding, ding ... we have a winner :!:

... especially when so many guys gush over pedestrian Japanese turntables with who-knows-what-kind-of-cheap-metal platters that ring like a bell if you flick the edge.

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1987 Guild Nightbird, 2000 Taylor 310KCE, and Godin 5th Avenue Guitars.

If you can use one of those newfangled Internets, you can post photos in your damn classified ads. :roll:


Last edited by Quadzilla on Sat Jul 22, 2017 10:43 am, edited 1 time in total.

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PostPosted: Sat Jul 22, 2017 10:42 am 
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Just going by memory here, but the single layer glass platter does ring.

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PostPosted: Sat Jul 22, 2017 10:47 am 
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ripblade wrote:
Just going by memory here, but the single layer glass platter does ring.


You do use a lot of power tools though. :mrgreen:

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PostPosted: Sat Jul 22, 2017 10:53 am 
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Tom_r wrote:
The glass will not distort unless you're putting it in an oven at ~580 degrees C, so as suggested you need to look further.



Maybe he should put it in such an oven?

Who knows I heard they cook cables.


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