DIY Schroeder Tonearm???

[kenev]

That's amazing!
Even with the YouTube low resolution sound quality, the difference is obvious in favor of the DIY tonearm.
Great job Ed!

 

[suwaned]

hi Evangelos..
a results with arm from carbon fiber of Fishing rod provide a detailed tone. I have compare this with wooden rod.

 

[mswann]

Hi,
any advice on the best thread / line to use?
Regards
Mark

 

[deadhead]

I realise that this thread has gone very quiet and the major players may not look in here anymore but...

Did anyone who made a clone curve the surface of the magnet fitted in the arm as Herr Schroeder seems to do on his arms?

If you did, what technique did you find best ?

I am gathering information to build two arms at the same time ( why build one when two only costs twice as much ) .

I have read all through this thread twice now and don't recall anyone mentioning curving their upper magnet.

Help would be appreciated .

 

[stoN_Cold]

Did anyone who made a clone curve the surface of the magnet fitted in the arm as Herr Schroeder seems to do on his arms?

What exactly is it?

 

[deadhead]

What exactly is it?

What is what?

 

[stoN_Cold]

What is what?

clone curve the surface

 

[deadhead]

Ah.... Frank Schroeder puts a curve on the face of the magnet that fits in the arm.... it is not a flat face like the lower magnet.

I just wondered if any builder of his arm on here had done the same and, if they had...how did they do it.

 

[stoN_Cold]

Ah.... Frank Schroeder puts a curve on the face of the magnet that fits in the arm.... it is not a flat face like the lower magnet.

I just wondered if any builder of his arm on here had done the same and, if they had...how did they do it.

Pic ?

 

[hottattoo]

You don't have to grind a curved surface of the magnet face, just use a thin piece of iron and machine a curve on the iron piece and put that on the flat ace of the magnet. The magnets power will go through the rounded iron piece with no problem.

 

[deadhead]

Pic ?

You will have to look closely at pictures of 'real ' Schroeder arms to see what I mean. It is subtle but there is definitely a curve on the face of the top magnet. It is one of the the 'secrets' of why his tonearms work so well... and why some people have trouble with their diy arms in keeping a constant VTA and also VTF across the whole of the arc of movement.

 

[deadhead]

You don't have to grind a curved surface of the magnet face, just use a thin piece of iron and machine a curve on the iron piece and put that on the flat ace of the magnet. The magnets power will go through the rounded iron piece with no problem.

I never thought of doing it that way... would it definitely work and not diminish or change the magnetic field/flux in any way?

If not then that is a contender.

 

[stoN_Cold]

I did not find it on official website.

 

[deadhead]

I did not find it on official website.

Ok... look at this photo.. you can see the curve in the magnet in the arm.

 

[stoN_Cold]

If you mean this black marked by an arrow, it's part of the tonarm lift.

 

[deadhead]

No.. the magnet it the steel arm tube is curved.

 

[stoN_Cold]

Optical illusion is not curved.

 

[Hiten]

Schroeder tonearm magnet
Here is closeup of the tonearm. The magnet is not curved.

 

[hottattoo]

IIRC, Frank said the space between the magnets was about the thickness of a a business card --- about .010". At that space, the magnets would touch on the edges as the the arm is raised or lowered if both magnets are flat. You probably could raise the arm slightly more above the lower magnet and get away with flat magnets--at reduced magnetic power. A slight curve on one of the magnetic surfaces using a piece of iron is what I would do. I would choose to this on the bottom magnet since you can use a bigger (more powerful) magnet if needed. Either approach should work.

 

[directdriver]

Ok... look at this photo.. you can see the curve in the magnet in the arm.