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#1 Magnetic antiskate

Posted: Wed Apr 15, 2020 11:02 am
by vinylnvalves
It’s about 30 years since I last built a tonearm. So I have been searching the web for inspiration and came across this https://www.diyaudio.com/forums/analogu ... tions.html. Has anyone played with anything like this, I had a Decca unipivot decades ago - which I dismantled to understand it better. As the Morsiani arm is meant to be up there with the best.

#2 Re: Magnetic antiskate

Posted: Wed Apr 15, 2020 11:31 am
by IslandPink
I haven't but that's a great thread with Morsiani actually there in person.
I know James D put the Morsiani tonearm at the top of the tree.
I'll have a bit more of a read later.

#3 Re: Magnetic antiskate

Posted: Wed Apr 15, 2020 12:43 pm
by vinylnvalves
I understand the principle... what I cannot fathom is what the structure ( looks flimsy) which goes over the tonearm is for, i thought at first it housed the magnets but clearly not, see http://www.morsiani.it/

#4 Re: Magnetic antiskate

Posted: Wed Apr 15, 2020 1:40 pm
by ed
this intrigued me years ago, albeit after I'd given up vinyl......

but I always thought the second pair of magnets were in the top of the cup, and as the arm progressed towards the centre the effect of the magnets diminished.........

but I never got the real answer

#5 Re: Magnetic antiskate

Posted: Fri Apr 17, 2020 2:22 pm
by IslandPink
I see what you mean. Having the website still available is very decent of him - but it could do with a couple more pictures. I shall however save the pages and the diagrams he put in that thread, for future reference.

#6 Re: Magnetic antiskate

Posted: Fri Apr 17, 2020 9:52 pm
by vinylnvalves
Those two columns up either side of the arm, have different capping pieces on on various guises of his arms, some are plastic some aluminium. I wonder it to align arm, or a transport thing - don’t think it’s anything to do with the antiskate or the normal function of the arm. I am trying to figure how to include this antiskate approach into what from an engineering perspective I think is the best unipivot design.... that I can hopefully clone... the audiomecana Septum. https://www.tnt-audio.com/sorgenti/belladonna3_e.html.
I already have an aluminium billet ready to machine the arm from, just need to get the 4th axis working on the cnc router.

#7 Re: Magnetic antiskate

Posted: Fri Apr 17, 2020 10:15 pm
by Ant
Never heard of the septum arm, just had a look at it.
I do like the azimuth arrangement, very simple

#8 Re: Magnetic antiskate

Posted: Tue May 26, 2020 8:02 pm
by vinylnvalves
Whilst investigating magnetic anti-skate, I came across this. Interesting bearing arrangement. Easy to replicate, the duo pivots seem to have all the advantages of a unipivot without the disadvantages. Something to consider if I decide to build a new arm.


Torn between something simple like this and the Dynavector arms... the engineer in me likes the later...