What's the line stage gain? You will need to add the two together to get the total gain output. I would say around 60 db total would be about right for a cartridge with a .4mv output. That would yield a 400mv output.
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I have a Classe 4 preamplifier. It is factory set at 22 db MC gain in addition to the standard MM gain of 35 db and works just about right with my 0.8 mv Benz Micro Glider S M. Mofimadness' calculations are correct and would've been handy when I originally purchased a 0.4 mv MC cartridge which was a little too low. With your resistor set, you can increase the gain by 2 db at a time, so I'd set it at 61 db with the 26 db resistor vs. 59 db if you're going to have to solder anyway.