Would you use an Ortofon A90 on a Jelco tonearm?

Pani, What happened? You were a major avid fan of the ART9.

As to your present question, from what I hear about the Jelco, it would be an OK match with the A90.  The thing to do is to decide what you want in a cartridge, the A90 or the Windfield.  The A90 was a darling of reviewers but now seems to have lost its luster for some reason.  Also, there is some issue with re-tipping an A90 to its original specification. So if you are buying used, that is a consideration to be investigated.  It is not at all obvious to me that either Ortofon would be a significant upgrade to the ART9.  Different sounding, yes. Probably drier and more on the clinical side.  I have an MC7500, the grandfather to the Windfield and eventually the A90.  The MC7500 has that Ortofon family sound, very accurate, not much embellishment.

Lewm, the ART-9 did well for me for about 2 years. Just looking for something even better in terms of resolution and refinement. How would you describe the sonic difference between your MC 7500, windfeld and A90 ?

I have a per windfeld that I was thinking about selling if your interested. I am second owner. The first guy bought it as a demo from a dealer without the original packaging. Estimated to have about 300 hours on it. 
I would definitely put it on a jelco if compliance was a match on the vinyl engine calculator. They are good arms. 
Great cartridge too, I am only thinking of selling it because it doesn't work well on any of my arms. It's heavy with high compliance which is a bit limiting.