Quote:
Originally Posted by Ted Kendall
It's irritating in a way, but the fact is that the 5534A is still the best chip you can get for an MM preamplifier, even if it has been about for forty-odd years, and very close in noise terms to the best attainable with discrete devices, an approach which brings other and greater problems. The single stage EQ approach is the optimum, but to calculate the exact component values is non-trivial exercise, because of the complexity of the relevant equations. Still, Self has done the sums, so that's that problem kicked into touch. He's written a tome just about electronics for vinyl, incidentally...
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Just use Baxandall's values for R and C and you'll be fine. You don't need to get under the bonnet of calculating the values unless like me you are a bit of an analysis masochist,
Baxandall also shows an inverse RIAA. You plug that into the RIAA input and use your favourite audio sweep generator (or audacity via your computer sound card) and you can check your RIAA accuracy.
There is also a good paper on inverse RIAA here
http://www.hagtech.com/pdf/riaa.pdf . Both Baxndall's and Hagerman's designs need careful value selection for accuracy of course.
Craig