VTF measurments with a unipivot


I understand the VTF changes depending on the vertical position of a unipivot tonearm, and which way (up or down) in turn depends on the type of the unipivot (center of gravity in relation to the pivot point).

Can anyone clarify how the VTF changes in the VPI tonearms, specifically the Classic tonearm, i.e., whether the VTF increases or decreases as the tonearm is lowered? Thank you.
actusreus

Showing 1 response by moonglum

Hi Actus,
Realising that I'm possibly highlighting my lack of advanced mechanical knowledge, could you try the following experiment?

Assuming the bearing is as frictionless as possible :

- Balance the arm
- Tilt the arm upwards by a couple of degrees and release.

Does the arm fall, as if due to additional VTF, then gradually normalise in the horizontal position, or does it remain where you stationed it?

- Tilt the arm downwards a couple of degrees.

Does the arm rise as if due to a deficiency in VTF or remain stationary?
Alternatively, if you don't wish to upset your current settings, can you recall how it behaved when you last set up the cartridge?

Please note every arm I've owned has followed the former damped oscillation pattern but I don't preclude design ingenuity! :) :)

To my inexperienced mind this should give a clue as to it's "loaded" behaviour but I'm probably mistaken. :)
Kind regards....