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Mono cartridge classification

While researching various mono cartridges I notice that Ortofon makes specific reference to the cartridge (their SPU cartridges anyway) being best suited for playback of certain mono recordings. I don't recall seeing this mentioned for other manufacturers. These references are given in the form of a number (25 or 65 is what I've seen) followed immediately by a symbol that looks like a stylized letter "n" and then the letter "m". What does this symbol/abbreviation mean? How do I know which of these a certain recording is in? and I'm assuming its not that important to worry about since I don't see it mentioned by other manufacturers - or is it?
pkemery
gladstone
296 posts
 
Jonathan--the only thing I would quibble with is that it really is essential to clean the LPs thoroughly, both for sonics and to avoid extra stylus wear.
ldorio's avatar
ldorio
16 posts
 
CG25 and CG65 are the only true mono models that Ortofon makes, and they have no vertical compliance whatsoever. In theory, a spin on a stereo record would not have positive consequences for the vinyl.

In the SPU Mono GM MKII, not only is it a high output moving coil with suggested loading of 47k (3mV output at 5cm/sec). The coil assembly is rotated 45 degrees so that only lateral motion is sensed.

Why they have done this rather than making a true mono design... Not sure. But for the true mono heads who want the cartridge to be made the same as it was back in 1948, the CG 25 and CG 65 should satisfy you. We even sell a dedicated trafo for them.

I work for Ortofon
hesson11
237 posts
 
Thanks a lot Ldorio.

So the Ortofon OM D25M puts our a stereo signal, right?

-Bob
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