On 19/09/2013 10:53 AM, Arfa Daily wrote:
Anyone come across a tonearm with a single pivot point rather than the
normal four pivot gimbal ? I have a Thorens TD160 Mk II on the bench
that has come in to have the owner's 'soldered with a hot poker'
cartridge connections corrected. It appears not to be the original
tonearm that's fitted, which was a standard fully mounted type according
to the user and service manuals. This arm is a slim black skeleton, and
it just seems to rest on a single spike sticking up from the mounting
plate. If it wasn't for the wires, you'd be able to lift it right off
the deck. There is a fishing line-hung LBC weight on the left, and the
tracking counterbalance weight, as well as being adjustable fore and aft
to set the tracking force, is also mounted eccentrically, so that it can
be rotated to negate any off-axis force, such as from the LBC weight,
which would try to rotate the arm about its long axis.

I have never seen a single bearing arm like this before, and it doesn't
have any name on it at all. Anyone know what it is ?

Arfa

**It is called a 'unipivot' arm. Whilst they have their charms, I hate
the buggers. Almost impossible to maintain accurate zenith. They are
very low friction though and quite good for many MM carts. MC carts
should NEVER be used with any unipivot arm.

--
Trevor Wilson www.rageaudio.com.au