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In Reply to: Again this is simple..... posted by tubesforever on September 11, 2006 at 12:10:26:
Are you saying you've modelled how a beam formed by an armtube, cartridge and countweight behave when excited by a 15Hz resonance or impulse imparted by a record warp?It is indeed simple; a cartridge exerts torque on the arm tube which acts agains any other force rting to deflect (rotate) the beam from vertical.
A C/W whose mass is split equally above and below the fulcrum (i.e./e.g. a circular concrentric one on a Rega, but not if it were on an SME)) doesn't exert any such torque.
It is 'intuitively' right that the C/W should also hang and provide a similar centering torque to the cartridge.
To reiterate, the problem is the unwanted variations in VTF an underslung C/W inflicts on a beam-centred pivot/fulcrum arrangment.
A compromise is needed (or a suspended 'smart' C/W), hence the Tecnoweight and my proposed DIY variation.
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Follow Ups
- Re: Again this is simple..... - Aleksunder 13:02:00 09/11/06 (3)
- The lower you hang the mass the more it delays return to vtf - tubesforever 14:57:26 09/11/06 (0)
- Re: but to complicate things .... - Aleksunder 13:26:07 09/11/06 (1)
- I am modeling this at the moment. - tubesforever 15:07:51 09/11/06 (0)