Dancing Cartridge.

In the case of the original (Ortofon OM5e I believe?) you have a cartridge compliance of 20 and the Tango is 12. Probable mismatch of cartridge and tonearm. The Grado's compliance is also 20. However, Project owners have complained about poor performance with Grados, you're not alone. A search of other forums will turn up several threads about this mismatch.

I've had some similar experiences with a Pro-ject Expression table using an Ortofon 2M Bronze, usually when the musical passage gets really complex on orchestral music. I've had no problems with the same table using a 2M Black or a Goldring 2500. I think the problem lies in the Pro-ject's arm lack of damping, which might make some cartridges with larger stylii (the two you've mentioned both have elliptical) jump around from arm vibrations. My 2M Black and Goldring 2500 have smaller, better-tracking stylii. You might try some tweaking of the arm such as wrapping it with teflon tape to see if it helps. Make sure your stylus force gauge is accurate and set the force to the high end of the cartridge manufacturer's recommendations (although you've probably already done this). If still no luck, you may want to try a cartridge with a finer, better tracking stylus. MM is the cheaper way to go. BTW, the Pro-ject's underdamped arm may also be responsible for its lively and exciting presentation. I've got a room full of tables and arms and cartridges--some costing thousands--and I've had a blast the last few months comparing it (often favorably) to the big boys. IMO the Pro-ject rig deserves a high quality, great-tracking MM cartridge; but be cautious and buy used, in case my whole theory is wrong!

Thank you both for your quick responses.The original cartridge that up to this moment is the only one that does not vibrate is a Sumiko Pearl I believe.The Ortofon Tango has a Fine line stylus on it.Dlshifi,what cartridge are you using on your expresion.I would love to have a good MM on my turntable , my problem is that my Preamp, Audible Illusions has the John Curl optional gold phono board specifically design for low output moving coils.Together it with the line stage has a 90 decibel gain,(30 on the line stage and 60 on the gold phono board)When I use a MM or my own grado black I'am overloading the phono stage to the extent that I can't pass the volume control past the 9 oclock position.This leaves me with no other choice but to use a low output design.I.ll try some way of adding more mass to the tonearm to see what happens.By the way,the project is in sonic terms a run away bargain .I've got the project speed control unit which made a big diference.I'll report latter after my experimentation adding mass to see if it keeps doing the Fred Astairs rutine.

I'm using the Ortofon 2m Black (nude shibata stylus, 22 compliance) on the Expression as stated with no problems. It's interesting that you had no tracking problems with the Pearl, since it's both an elliptical stylus and middling compliance. That might blow up my theory and demonstrate, once again, that audio is all too often just a roll of the dice. But given that the arm is low-mass at 8.7g and the Curl phono section requires an mc, then I'd begin looking for a high compliance(over 20) mc that won't bust the budget. I have no ideas along that line. Another option is to put a decent quality switchable phono stage alongside the Audible. I'd highly recommend the Lehmann Black Cube (used around $200) which I've mentioned before on this forum as getting my vote for the best bargain in all hifi. I still keep one as backup to my Ear 324. It may seem like heresy to do an end-around the Curl, but you'd be surprised at what the little bugger can do, and it would allow you to make choices from high-compliance finer-stylus MMs that are affordable.

Hey guys,I just found out that the cartridge I have on my turntable is not a ortofon tango but a ortofon Salsa low output moving coil,weight is 7 grams and compliance is 15.The one that came with the turntable is not a sumiko pearl but a oyster MM cartridge.Sorry guys,got my facts screwed up.Still experimenting.Will post latter if I get to fix my problem.Thanks Dlshifi and photon46 for helping me out.