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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: Cartridge coil questions posted by M3 lover on July 3, 2017 at 09:25:42:
The voltage output of a generator like a MM cart is related to the magnetic flux (at the centroid of the coils, presumably) and the geometry and number of turns of the coils. (the basic ideas of Maxwell and Lorenz...) The geometry of the coils, spacing, magnetic field strength. shape of the field, etc etc vary greatly in different cartridges so it gets very complex! Since all things are never equal, it's not possible to draw an exact proportional relationship between the DCR (which depends on the length and gage of the winding wire) and the output voltage. Anything above a few hundred ohms is probably generating roughly the a "standard" type of MM cart output of a couple mV (say between 3 and 5 mV) at a "standard" 5cm/s (speed of the stylus movement, RMS [?] at some frequency [?]). The upshot is that the difference between 400 & 600 ohms is likely of no real significance for a normal preamp's MM input.
There are a few Pickering / Stanton ultra-low Z, low-output MM carts that are truly fish of a different color if you are considering one of these? They are an extreme extrapolation of the MM design idea, intended to reduce the inductance of the cart I assume. I don't think they're a great concept necessarily - one could just get an MC these days- but they have their devotees of course!
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- RE: Cartridge coil questions - mr.bear 07/4/1712:14:38 07/4/17 (0)
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