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Old 22nd November 2007, 04:11 PM   #1
kitemap is offline kitemap  United Kingdom
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Default DIY Tonearm

Hello,
Being unspired by this, I've decided to try and attempt knocking up one myself.
I will post a progress report up here as I go along but I have a question that I need answering before I even get started with the main arm tube.
Is there any benefit to shielding the wires in the arm tube?
I will be a tube running down the centre of my dowel anyway, for ease of wiring/re-wiring and if shielding isn't an issue then it will be a thin plastic straw so I can bend it to shape. If shielding is an issue then what should it be made from?

Thank you

David
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Old 22nd November 2007, 05:52 PM   #2
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Based on what I've read, there doesn't seem to be any benefit from having shielded arm wires. As far as tubing goes, just use whatever works.

Looks like a nice arm. Is this going on a Lenco?

Jeff
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Old 23rd November 2007, 11:01 AM   #3
kitemap is offline kitemap  United Kingdom
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No, for now it will be have to be on it's own plinth and used on my Pink Triangle, as I'm going for a 12" arm. I'm planning eventually to make a turntable to suit.

Here's a little piccy of the arm tube and a cross section through. It will be Walnut on each side with a 4mm strip of Ebony down the middle with a slot in for the wires.
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Old 25th November 2007, 02:56 AM   #4
Nanook is offline Nanook  Canada
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Default tonearms...

Ok, another tonearm I thought about would be the use of hickory or maple drum sticks. The bows and cello parts are cool though. The really great thing about all this is that if you use even a small amount of care, good results can be had.

Your arm idea looks very good. Wish I could actually work with wood rther than murder it (I'm feeling a little woodicide happening soon )
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Old 25th November 2007, 11:08 AM   #5
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If you plan on using an MC cartridge or mounting the arm on a deck with an AC motor I think it would be wise to shield the wiring.
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Old 25th November 2007, 11:14 AM   #6
Nanook is offline Nanook  Canada
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Default or....

shield the motor
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Old 1st December 2007, 08:52 PM   #7
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The signal leads don't need to be shielded - use twisted pairs. You could try splitting CAT5. I rebuilt an SME with an ultra-light Balsa arm which has seen about 25 years service, and embedded single thread twisted pair enamelled copper wires and it's fine. Arm mass is critical though, especially if you want to be able to track warped records.

Mike
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