Grado "wobble"...?


I've searched the archives for info about this problem, but haven't come up with much. Can anyone please explain what exactly is happening when Grado cartridges wobble, and why they do this?

I bought a Grado green some months back, mostly as an inexpensive way to teach myself how to install a cartridge. (I've been a vinyl fan all my life, but was for years listening to it on a bland B&O linear-tracker.) Since then, I've changed tonearms (from a Thorens TP-16 to an Origin Live RB-250). When I did so, I was finally able to properly align the cartridge using the tool from Turntable Basics--the Thorens arm's fixed mounting holes precluded getting a perfect alignment. But since the change, I've experienced wobbling for the first time. It seems to happen mostly on 12" 45 RPM UK pressings from the 1980s, for whatever strange reason. I can see the entire cartridge body shake laterally, and sometimes the stylus will actually skip out of a groove.

Since this cartridge was basically intended as a throwaway, this is probably a good kick in the pants to get the new one I've been planning on, but can anyone shed some light on this phenomenon? Do the wood-bodied Grados wobble as well?

Thanks in advance,
Joshua
am_dial

Showing 1 response by jonbok

I have only a little to add. Never owned a Grado- always kind of wanted one. I have had a Rega table for six years (rb-300 and 900 arms) and I have heard that rega arms are especially bad for the 'Wobble'... ie. the people who say great things about the cartidges don't use them on Rega arms. There can be a compliance issue but I think Rega uses an odd grounding scheme and Grado does not shield their magnets on the motor which can lead to the 'wobble'. I have never heard of a 'fix' for it. Check out the vinyl area at audio asylum. There probably hundreds of posts on this. Good luck