Linn to Rega bearing conversion. - diyAudio
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Old 4th April 2008, 01:14 PM   #1
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Default Linn to Rega bearing conversion.

this is actually part of another project but may be of interest to anyone who wondered if the crap plastic injection moulded Rega subplatter was just that, crap.

As part of a Mag-lev main bearing project i've fashioned a Linnlp12 subplatter and bearingto fit the standard Rega dimensions, ie 100mm diameter.

It requires a fair bit of jigging to fit from a height perspective, it needs a press fit flange for the top section of the bearing housing so it will sit level and flush with the top of my plinth.

But it's a damn sight more concentric than the stock Rega part and it spins much more freely.

According to various reviews it should be quieter even before the mag-lev, Rega -73db, Linn -81db for bearing rumble. After maglev they are even quieter still.

It's actually quite concerning how out of round the Rega part is, no wonder their speed is all over the place, even with the TT-psu fitted..

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Old 4th April 2008, 01:51 PM   #2
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Hi, I've often looked at those plastic Rega sub-platters and wondered if they were a weak point.

How far out of true are they? I guess it would be fairly simple to turn up an aluminium one, or even in Delrin if there really is a reason for the original being non-metallic.

i have a P2 sitting on the floor looking unloved right now - I wonder if it's worth a try?
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Old 4th April 2008, 07:35 PM   #3
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Default Re: Linn to Rega bearing conversion.

Quote:
Originally posted by sq225917
this is actually part of another project but may be of interest to anyone who wondered if the crap plastic injection moulded Rega subplatter was just that, crap.

As part of a Mag-lev main bearing project i've fashioned a Linnlp12 subplatter and bearingto fit the standard Rega dimensions, ie 100mm diameter.

It requires a fair bit of jigging to fit from a height perspective, it needs a press fit flange for the top section of the bearing housing so it will sit level and flush with the top of my plinth.

But it's a damn sight more concentric than the stock Rega part and it spins much more freely.

According to various reviews it should be quieter even before the mag-lev, Rega -73db, Linn -81db for bearing rumble. After maglev they are even quieter still.

It's actually quite concerning how out of round the Rega part is, no wonder their speed is all over the place, even with the TT-psu fitted..

Click the image to open in full size.

Click the image to open in full size.
Regarding the accuracy of the stock Rega subplatter: Did you use measuring equipment to check runout.? If so, what deviation did you measure?
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Old 4th April 2008, 10:26 PM   #4
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the runout was all over the place, but two main high spots, one at +.12mm and the other at+.08mm

I guess they do spit them out of the injection tool way too fast.

the modded Linn version is good to 1/100th, past the limits of my borrowed probe.

jeff if you are willing to knock the top cap off the rega subplatter you can skim them on a lathe with a decent spinning centre. I did this to my previous Project subplatter and it made a huge difference to pitch accuracy.
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Old 6th April 2008, 11:16 AM   #5
YNWOAN is offline YNWOAN  United Kingdom
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sq225917, do you think posting this thread has been worth the effort?
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Old 6th April 2008, 02:18 PM   #6
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of course, you never who might read it and be inspired, just because they don't reply doesn't mean it hasn't been of some benefit to someone.

I wasn't expecting it to start a rash of small scale production of improved Rega parts from Linn parts, most people would have to acquire the linn parts first.

If just one person skims their rega platter to better tolerances then its worthwhile.
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Old 6th April 2008, 02:55 PM   #7
YNWOAN is offline YNWOAN  United Kingdom
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Fair enough - bit out of character for you to be such a 'voice of reason' though Si
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Old 6th April 2008, 05:58 PM   #8
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You have me all wrong, I like a bit of banter and needle, and throwing round offhand comments that display an abject lack of any sensibility for other peoples feelings.

But in reality i'm actually the most considerate person you'll ever meet.
























Just not to you you prick.
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Old 12th April 2008, 08:58 PM   #9
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It has been of benefit to me and some friends.Will not buy a Rega turntable......!!!!!!!!!!!!!!!!!
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Old 12th April 2008, 10:29 PM   #10
YNWOAN is offline YNWOAN  United Kingdom
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I don't think that was sq225917's intention with this thread was to put people off buying a Rega. I actually know sq225917 quite well and it is a version of the magnetic bearing that I designed for my deck that he is building for his (he got it working today so may post a bit more). The Rega (in my opinion) has proved to be a good 'donor' deck - although not much of it remains now. The Rega inner platter has pretty good dimensional accuracy for an injection moulding - the Linn item sq225917 is referring to was custom machined to the correct size and is inherently more concentric.
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