problem with Grace g-940

[Antripodean]

Hi everyone

I am trying to set up my Grace G-940 arm; the unipivot. I bought it second hand some time ago and for so many reasons I haven't put it on my other TT (probably because I have been happy with my PS-X60 with PUA-7 tonearm).

Anyway, the pivot seems to lean to the right all the time. Does this mean it has jumped off the pivot? Run out of silicone oil? Or something far more mysterious?

Any assistance is greatly appreciated

 

[planet10]

have you adjusted the lateral weight?

dave

 

[Antripodean]

have you adjusted the lateral weight?

dave

yes, as far as I know. It appears the lateral balance weight is not heavy enough to straighten the tilt

 

[planet10]

Then something is hanging up. What does the pivot point and the cup look like?

dave

 

[Antripodean]

Thanks Dave. I will have a look inside. I was trying to see if there was a simpler solution but it seems not. C'est la vie

 

[brianco]

Have you checked that the wire between the pillar and the arm tube has enough freedom?

 

[kevinkr]

I would also look around on Vinyl Engine | The Home of the Turntable, there is likely to be someone who may have a specific recommendation as to what the problem may be.

Is the Cartridge you are using in the recommended weight range? (not tracking force)

 

[Antripodean]

thanks; looking at all the options. no cartridge at this stage, need to get it working properly first

 

[kevinkr]

thanks; looking at all the options. no cartridge at this stage, need to get it working properly first

The fact that you have no cartridge installed may be the root of your problem. The uni-pivots I have owned all required a cartridge to be installed before adjustment of the lateral compensation weight resulted in proper playback geometry. Find an old cartridge or possibly purchase the one you intend to use and then try to set the arm up - I think you will find it works a lot better.

 

[planet10]

I concur with Kevin. Without the mass of the catridge, it won't balance ...

dave

 

[mariogert]

In case your problem has not solved; take off the rear balance weight. The thing that you "screw" the balance weight on can be adjusted in small increments.
On the underside there is a small set-screw. try to locate this and loosen. The sliding tube can be adjusted more or less "off-center" so you will be able to use a heavy headshell-cartridge combo. This way the moving-mass can also be adjusted to your taste.
The side weight is used to fine balance the azimuth horizontally. The damping can be adjusted by loosening the black top/set screw so the arm cup lowers a little in the sillicon oil well inside the arm pillar.
Have fun with this magnificent tonearm.
Mario Gert