The 1/3 point for resonance control on Rega arms works for the 250 and I've heard that is will also be effective on the tapered tubes of the higher models too.
The RB250 has adjustable bearings on both sides of the arm tube. My OL Silver takes this one step further, and uses better bearings, AND re-locates the bearings out into the yoke instead of in the arm. Way more stable.
Rega states that the bearings are upgraded as you go up the model line. I have never disassembled all these arms to check that out. The RB250 bearings seem to be sufficient, as long as they are well adjusted.
I doubt that the OEM Rega arms are not as good as "real" Rega arms. That would require a different assembly procedure, and that is unlikely. They are most probably exactly the same, with different names printed on them. I don't think that Rega would go out of their way to make a lower quality arm, that would be associated to them anyway. That would damage their reputation, and the reputations of the TT makers buying those arms, and that would not be good for anyone.
The RB250 has adjustable bearings on both sides of the arm tube. My OL Silver takes this one step further, and uses better bearings, AND re-locates the bearings out into the yoke instead of in the arm. Way more stable.
Rega states that the bearings are upgraded as you go up the model line. I have never disassembled all these arms to check that out. The RB250 bearings seem to be sufficient, as long as they are well adjusted.
I doubt that the OEM Rega arms are not as good as "real" Rega arms. That would require a different assembly procedure, and that is unlikely. They are most probably exactly the same, with different names printed on them. I don't think that Rega would go out of their way to make a lower quality arm, that would be associated to them anyway. That would damage their reputation, and the reputations of the TT makers buying those arms, and that would not be good for anyone.