diy unipivot V-Sapphire bearings tonearm 10.3"

[arun101]

Spindle to pivot 247.4 mm
Overhang 15.6 mm
Offset angle 20.8 degrees

 

[arun101]

Sapphire bearings cup

 

[arun101]

.

 

[warrjon]

Very nice.... Can I ask what size bearing cup did you use?

 

[Marra]

A beautiful arm.

Might I ask from where you obtained your jewel bearing.

 

[arun101]

I buy from this website
True Point Audio

Size of bearing is in picture
I use “S222”

If you interested you can contact

sales@true-point.co.uk

 

[ralphfcooke]

Many years ago I built a unipivot arm, and used the jewelled bearing cup from an old moving coil voltmeter.

 

[directdriver]

The magnetic guide appears to be the same concept as the Graham Phantom tonearm, except the outrigger rod is not angled as same degrees as the headshell offset angle. Since it has a secondary bearing, it is not a true unipivot design and I personally prefer it for better stability over the traditional design.

Well done.

 

[Marra]

Thank you.

 

[AVWERK]

Very nice build, nothing beats the satifaction you get plus saving a lot of money
along the way, enjoy!

Regards
David

 

[warrjon]

I buy from this website
True Point Audio

Size of bearing is in picture
I use “S222”

I have 2 of those jewels.

True Point are easy to deal with and Charles is helpful. He suggested that a dual cup Jewel was a better option for a unipivot as the pin can ride up the V when cuing which the dual cup prevents. True Point used to supply Naim with dual cup Jewels for the Aro.

A Vee Jewel will work as long as the pin has an acute angle to prevent it fouling the side of the Jewel when the arm is up.

 

[trekpilot]

Beautifully done and very classy looking!

I also used True Point when I made my tonearm a couple years ago they were very helpful in guiding me and answering questions.

Regards,
Scott

 

[Arch Stanton]

Fantastic job !


But since the magnet carrier turns around the pillar on a ball bearing (I suppose) is this really an unipivot arm ?

 

[hottattoo]

Hi, arun101

Beautifully made with nice construction and detail !!! Well done !!

Joe

 

[arun101]

Correct!

I use both of Graham Phantom and Duran Talea and I try to combination the strong point of each concept.

The magnetic guide I use the same concept as Graham Phantom. But for the tonearm I use the same concept as Durand – Talea and stylus will in the middle of tonearm, so I guess the the degree of the headshell offset maybe is not matter. This concept should improve the stability as you said (I guess).

The magnetic guide appears to be the same concept as the Graham Phantom tonearm, except the outrigger rod is not angled as same degrees as the headshell offset angle. Since it has a secondary bearing, it is not a true unipivot design and I personally prefer it for better stability over the traditional design.

Well done.