How important is Cartridge Overhang? Need help

Just curious, and I have a question.

Is there a way to verify the Arc Protractor itself, that it was indeed made to proper spec? Should there then be a specific measurement from center of Protractor spindle hole, to the Arc on protractor? Mark

Dear Wilson667: That is something that you have to check " live ": I mean you have to measure ( you have to do it physically. ) the distance between the stylus and the tonearm pivot.

It is hard to believe that with that tonearm you can set up that cartridge: the overhang ( center of the TT spindle to stylus. ) must measure 18mm.
Now if the spindle to pivot distance is 212 and you can't get/match 230mm from stylus to pivot then you need a different tonearm or a different cartridge or you can make wider the headshell slot.

regards and enjoy the music,
Raul.

Hi, Wilson667, have been gone this weekend or would have responded earlier. Sounds as if the tone arm MAY have been redesigned and the specifications have not been revised to reflect a different effective length of (perhaps) ~237.5mm. That's assuming that Pro-Ject still designs the headshell for a range of cartridge mounting holes-to-stylus distances. If the center of the slots is at 228mm plus ~9.5mm gives an effective tone arm length of ~237.5mm. The other assumptions are that the headshell offset angle has been revised to accomodate the Lofgren A/Baerwald alignment geometry and that Pro-Ject may have unfortunately failed to change the pivot-to-spindle distance to ~220mm to accomodate the revised effective length.

So many variables and so many assumptions. Not a good scenario.

My advice is for you, or the retailer that sold you the turntable, to contact Pro-Ject/Sumiko USA and ask about the apparent discrepancies.

Tom

Agree w Tom. Something does not seem to be right.

It sounds like the arm was positioned using effective length from spindle to pivot instead of spindle-to-pivot length (eff. length minus overhang).