DIY Schroeder Tonearm???

[zeonrider]

Originally Posted by krishu

IMHO the ground wire should be connected to the arm tube as close as possible to the tonarm bearing, i. e. not at the headshell. But that might work as well.

Christian.

Tube made of wood!

Regards zeoN_Rider

[binspaul]

Hi ,

The arm tube is not fully made up of wood. The rear end of the arm wand is of Aluminium. I think Christian is right. I too was thinking in the same line. But, will that affect the eddy currents generated in the aluminium tube ? In that case, the best place will be the head shell.

@Frank: What is your suggestion ?

Best regards,
Bins.

[zeonrider]

Originally Posted by binspaul

In that case, the best place will be the head shell. What is your suggestion ?Bins.

Headshell

[Jeffrey Davison]

ah... but what if the arm tube is made of wood as the Schroeder is?

Originally Posted by krishu

IMHO the ground wire should be connected to the arm tube as close as possible to the tonarm bearing, i. e. not at the headshell. But that might work as well.

Christian.

[Magura]

Originally Posted by Jeffrey Davison

Brass and Aluminum get a bit too friendly after a while, this thing called electrolicic reaction, don't ya know.
JD

So does copper and aluminum. You need to do something to prevent galvanic corrosion.

I am speaking from very bitter experience.


Nice project though.

Magura

[Jeffrey Davison]

I brush on a nice coating of "Anti-Seize" compond from a company called SAF-T-EZE,(STL Compund Corporation).which contains nickel and graphite in it's lubricant, around threads and movable mating surfaces.

The stuff is easily found in hardware stores and automotive supply shops.


Machine oil, imo, just doesn't offer enough protection in the long haul and has a habit of running off over time, The Anti-Sieze is tenacious and stays where put.

JD

Originally Posted by Magura

So does copper and aluminum. You need to do something to prevent galvanic corrosion.

I am speaking from very bitter experience.


Nice project though.

Magura

[krishu]

Originally Posted by Jeffrey Davison

ah... but what if the arm tube is made of wood as the Schroeder is?

then you need to put some shielding into the wooden tube, e. g. a small carbon tube or metal foil which then is connected to ground. You could also use shielded tonearm cable in the tube, then no further shielding is necessary.

[Jeffrey Davison]

perhaps if you twist pairs + and - for each channel, then the external ground/shield would not be neeeded, as twisted pairs have a shielding effect.
So there would be two twisted pairs from the cartridge clips, through the arm and out to the rca's ( or whatever interface. (I'm using a Lemo connector on a junction box with a pair of RCA's to the "outside" world. THe junction box is connected to the turntable ground. This works very well in a modified SME/Thorens TD160 I've been using for a while now... Only 4 wires through the arm to the RCA's and no hum.... and the armtube is NOT grounded.

JD

Originally Posted by krishu

then you need to put some shielding into the wooden tube, e. g. a small carbon tube or metal foil which then is connected to ground. You could also use shielded tonearm cable in the tube, then no further shielding is necessary.

[zeonrider]

Originally Posted by Jeffrey Davison

perhaps if you twist pairs + and - for each channel, then the external ground/shield would not be neeeded, as twisted pairs have a shielding effect.
So there would be two twisted pairs from the cartridge clips, through the arm and out to the rca's ( or whatever interface. (I'm using a Lemo connector on a junction box with a pair of RCA's to the "outside" world. THe junction box is connected to the turntable ground. This works very well in a modified SME/Thorens TD160 I've been using for a while now... Only 4 wires through the arm to the RCA's and no hum.... and the armtube is NOT grounded.

JD

That what I, talking about.

4 wires twisted and one wire around 4 signal wires.

Regards zeoN_Rider

+ thin metal plate above head.

[binspaul]

Hello JD,

1. Nice suggestion. How many twists (twists per foot) do you use for the cable ?

@Frank: What is your suggestion ? This is getting more complex...

Best regards,
Bins.