Would you use an Ortofon A90 on a Jelco tonearm?

Analogluvr, The compliance to effective mass match is not very restricting as I see it. Based on the equation, the resonant frequency is inversely proportional to the square-root of the product of mass X compliance.  Because we take the square-root of the product, that allows for a fairly wide range of values.  If you want the Fr to be in the range of 8 to 12Hz, the inverse of the product of mass times compliance can range between 1/64 and 1/144, or more than 2-fold. So, I worry about it, but only a little bit.

 I just find that you often read of ridiculous  statements like my Denon 103 sounds great on my Infiniti black widow. Well not to say it doesn't sound acceptable but it would sound a heck of a lot better on a fr64.  So I agree that there may be outliers based on arms with resonant damping properties but you cannot cheat physics. And it seems too many folks involved with analogue play back pay zero attention To these basic parameters.

Just in case you land on this thread, Jelco introduced the 850/950 which are a significant improvement over the 750 alluded to above.

 Just for the heck of it, I re- read most of these posts from more than a year ago. It was interesting to see the prevailing arguments about re-tipping versus not retipping as they were hashed over back then. Nothing has changed. But one thing I found interesting is that no one asked the OP about the effective mass of the Jelco tonearm with which he is concerned. However he mentioned that he was aggravated because the manufacturer did not publish a specification. Perhaps this is because the effective mass is a moving target that will be dependent upon the weight of the cartridge and the weight of the head shell and screws. And since many of us fiddle with aftermarket headshell s, that adds yet another indeterminate value to the equation for effective  mass. So in the end , It’s a crapshoot. Best we can do is know what ball park we are in. For example, a tone arm is heavy or medium or light in mass. But I think that’s good enough. Sounds like the jelco would be in the medium to heavy category. And if it’s like other moving coil cartridges, the A90 is likely low in compliance. So the match is probably acceptable. These days, we have the newer Jelco tonearms to choose among, and those are probably superior to the model 750.