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Old 22nd June 2013, 03:47 AM   #1
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Default DIY linear tonearm

Here is my latest project, a linear tonearm. I thought I'd take a step away from the amplifier arena and give it a go, this is 1.5 weeks of work from start to finish and the sound
Is fabulous. Being mechanical without servo, carriage weight is of utmost importance!.


Colin
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Old 22nd June 2013, 03:50 AM   #2
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Another photo
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Old 22nd June 2013, 04:55 AM   #3
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Great work! Thanks for sharing your project online.

I just saw two DIY mechanical linear arms on a Taiwanese blog yesterday and they remind me of your project.


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This one on two rods like the Souther arm.

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Another one inspired by the Opus 3 Cantus tonearm.

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Old 22nd June 2013, 05:40 AM   #4
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Thanks Directdriver,

I looked a lot of the DIY designs, I didn't catch those though, thank you!. I wanted simplicity, I tried something years ago that didn't pan out but finally got onto one that did . There is something about the sound of a linear tracker that once setup right just sounds more 3d sonically, more coherent and resolved.
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Old 28th June 2013, 09:48 PM   #5
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Default Upgrade

Upgraded version with a borosilicate glass tube arm wand which weighs a meager 2 grams. All mass total of carriage is 22 grams including cartridge, not bad at all.
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Old 28th June 2013, 09:54 PM   #6
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Default And another shot

Another side shot . This is a phenomenal sounding arm, very neutral and tonally correct without emphasis across the audio band, surface noise is inky black on clean pressings.
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Old 28th June 2013, 10:17 PM   #7
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Really nice! Can you show more pictures from different angles so we can see the bearings? Thanks!
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Old 28th June 2013, 10:23 PM   #8
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Bearing shot, 4 5x9mm sealed bearings that ride on the top of the glass tube, I used brass bushings to essentially provide a double bearing effect which further lowers friction vs a locked bolted bearing center.
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Old 28th June 2013, 10:29 PM   #9
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Another bearing shot
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Old 28th June 2013, 10:35 PM   #10
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Also with the way the bearing rides only the corner of the bearing contacts the upper round of the glass which minimizes contact area which accomadates the vertical tracking from the same point as horizontal movement. The borosilicate glass is very hard to scratch thus remains very smooth and with a tiny bearing contact area dust doesn't impede movement.
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