Recensioni e Schede

I bracci  di Morsiani

 

 

Di cosa si tratta

Bracci  strepitosi

L'importanza di iscrivervi alla newsletter

Produttore

Morsiani Scandiano

Caratteristiche

Braccio grafite o legno

 

L' amico Carlo Morsiani  da Scandiano RE ,  che conosciamo già da queste pagine qui sotto

 

               

 

 

I bracci  Morsiani sono  tutti UNIPIVOT   con  ANTISKATING   magnetico , sotto trovate  la descrizione in inglese , a presto quella in italiano.

 

Classico CM1

 

 

Con portatestina  e canna  in grafite  ,sollevamento  a levetta , disponibile  sia da 10 che 12 pollici

esempio applicazioni:

 

 

CM 1 graphite on Linn LP 12                                  CM 1 graphite on Teres

 

Modello CM 1 VTA

 

e la versione evoluta di quello presentato sopra , con regolazione con ghiera micrometrica dell'altezza  , molto comodo nel caso di sostituzione  testina e/o prove con vari tipi di tappetini

 

 

  

 

Modello COCOBOLO

 

 

  

 

   

La dima per trovare la giusta posizione ,    a destra la bilancina per il peso  della puntina

 

   

Il vinile senza solchi  per provare l' antiskating   e Carlo a destra  che controlla se tutto va bene

 

Come suona :

 

Chi scrive non è un specialista del vinile e come tale  dovete  giudicare le mie parole , ma mi sono tolto la soddisfazione di   farmi dare da Carlo  un giradischi  che accettava il suo braccio  e confrontarlo  con un Project P6 , vi allego la foto qui sotto:

 

 

 e vi  assicuro che la differenza e impressionante , notata da tutte le persone  alle quali lo fatta ascoltare , anzi siete tutti invitati  a sentire con le vostre orecchie.

 

 

CM1 tonearm

After years of research, this tonearm was published for the first time on the italian review “Costruire hi-fi”, starting from the N°15 (july 1995). The main features are: unipivot bearing and a new magnetic antiskating with 4 Alnico Magnets, published for the first time on “Costruire hi-fi”N° 18 jan 96(copyright owned by the author).               

BEARING 

In the unipivot bearing the arm has only one bearing point for all planes, in the cardanic bearings the arm has separated bearings, for the horizontal plane and for the vertical plane. In the cardanic bearings some clearance is required to have a low friction, in the unipivot bearing the mass of the arm stands on the pivot, closing the clearance to zero. In the cardanic the clearance is increased by the wear, in the unipivot the clearance is self adjusted to zero by the arm weight, and it is not increased by the wear. Why is the clearance so important? The stylus, following the groove countours, is a vibrations source, these waves see the clearance as a boundary reflecting the waves back. The zero clearance unipivot bearing is a pathway though which the waves are discharged away from the arm, making the sound cleaner. The pivot has a key role, in some arms very hard matters are employed, as tungsten, wolframium, ruby, diamond or ceramic, but harmonic steel, just a grammophone needle, is the best sounding pivot.  A true unipivot arm can roll around the stlus-pivot axis, in some unipivot arms this is avoided adding friction surfaces, my reserch demonstrated to me that all these devices reduce the sound quality, the best way to make the arm stable is to lower the barycenter, without adding mechanical linkages. In some unipivot arms silicon dampers are employed to stabilize the sytlus pressure, because unipivot arms can be only statically balanced and not dynamically balanced, as some cardanic arms. In these a spring is employed to make the stlus pressure stable, but the spring works like a dynamic compressor. In the unipivot arm a spring can not be employed, and the silicon dampers acts like a mechanical linkage reducing the dynamic energy of the reproduced sound.                 

ANTISKATING 

The skating force pulls the arm toward the disc center, this force is is not constant, but it decreases toward the disc center. Standard antiskating produce a constant force only, the pressure of the stylus on the two groove walls can be balanced only in one point of the disc, this means that in all other points the pressure is not balanced, the antiskating force is not correct, and mistraking occurs, causing noticeable distortion. My magnet displacement (copyrighted) is shown in the drawing, there are 4 Alnico magnets. This is the first antiskating in which the magnets can be adjusted to reduce the antiskating correction with the same ratio as the skate force is decreasing, the stylus pressure on the two groove walls can be balanced from the beginning to the end of the disc. The stereo image is focused and stable and the distortion low as never previously experienced. In the past the only example of unipivot tonearm with magnetic antiskating was the Decca International arm, but the magnetic antiskating was not ajustable as in in my tonearm. Some time after my tonearm presentation, other manufacturers introduced unipivot tonearms with magnetic antiskating, but to avoid law prosecution they do not copy exactly my magnet displacement, and they do not claim their antiskating with a decrasing force to the disc center. My pirates change something, employing other displacements not  so fuctional and adjustable like my original arm.. Sorry: it is the previlege of Originals to be plagiarized. To adjust the antiskating an”antiskating test disc” is supplied with the tonearm. The instruction manual is exhaustive with many drawings.                    

CONSTRUCTION CM 1 

CM 1 Carbon tube -graphite headshell. The arm tube is  made of carbon-fiber with inside wool damping. Two lenghts aivable: 9 and 12 inches. The headshell is made of electrographite, ( not removable). The graphite properties are explained in the following turntable section . The 12’arm has less tangential error but an higher inertia, it is advisable for medium-low compliance cartridges, (12 compliance units, traking pressure not less than 1, 8 grams). In these cases the resonance frequency is not below  8 hz. For higher compliance cartridges the 9’ arm is recommended, to keep the resonance above 8 Hz. With the 12’ arm the resonance may be below 8 hz. In this case the subsonic frequencies are too much and the elastomeric joint of the cartridge is weared more quickly.

Cm 1 "Low mass"carbon tube -alluminium headshell.To match very high compliance cartridge, the” CM 1 Low mass” is recommended, its headshell, made of anticorodal, is lighter than the graphite headshell, reducing the inertia to minimum. This arm can track well at 1 gram the highest compliance cartridges aivable.

CM 1 Wood.  This is made of one wood piece . This arm is recommended only for low compliace cartridges. The adjustments of the weight and lateral balance are micrometric with endless threads.

 WIRING. Ofc copper  silk coated). Van den Hul golden cartridge pins. The only connectors are the cartridge pins and the RCA connectors for the transformers or the preamplifier. On request other wirings and connectors can be supplied. 

Supplied accessories:

Computer made aligment gauge is supplied with the arm.

 Replacement pivots.

A stylus pressure gauge is required to adjust  the arm. The stylus pressure gauge is not supplied with the arm, and it can be ordered as accessory.

 

 

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