Originally Posted by
hifi_dave
In my experience, Rega have always been most helpful and knowledgeable - bending over backwards to help when needed.
It is true that the "RB300 was not designed to be used with the Ortofon cartridge" in question, because the RB300 was designed back in 1982, a full 24 years before the Ortofon Blue.
As I said previously, I have fitted many Ortofon Blue and Red cartridges to the RB300 and now the 301 and 303. My own demo RP3 has a Blue fitted. It went on easily, was no trouble to set up and sounds great, so I don't know where the confusion stems from.
Over the years from when the RB300 was introduced, I have fitted and used, without a hitch, literally thousands of cartridges from Ortofon, Rega, Goldring, Dynavector, A&R, Audio Technica, Fidelity Research, Linn and even Decca and Koetsu. So, a little ol' Ortofon Blue is not going to be a problem.
The sleeved nut is used with older Planar turntables which have the larger cutout on the baseboard. It takes up the space, nothing more.