Phono pre amp

So vdH is making the calculation for you in recommending a tonearm with 14g effective mass.  That should not be taken as a firm directive.  12 to 16g would be fine.  Note that effective mass should include the weight of the headshell, the cartridge itself, and the screws/nuts that hold the cartridge in the headshell.  Most tonearm effective mass specs will include the mass of the OEM headshell. Since all those other items are out on the end of the lever, they can pretty much be added to the mfg spec by simple arithmetic. If you use an aftermarket headshell that differs in weight from that of stock, just add or subtract accordingly, in grams.  I've got to disagree with MC on the idea that "any" phono stage would be adequately driven by 0.65mV output.  Just off the top of my head, I would say you need at least 55-60db gain.  My main point is that a typical MM phono stage will not do the trick.  Those typically supply 40 to 50db, max.  

chasda, I won't contradict any of the above posts, but in my experience vdH cartridges come in wood boxes.  Inside the box, on the underside of the removable cover, you will usually find hand-written specs for that particular cartridge.  Those data are what I would use for a reference, not whatever anyone else here got off the internet.  What you want to look for is "cartridge output" and "compliance".  Output will be stated in millivolts (mV) in relation to a stylus velocity.  Since stylus velocity is standardized at either 3.54cm/sec or 5.0cm/sec, we can disregard the velocity for now.  Just tell us what is the output in mV.  Likewise, what is the compliance in terms only of the numbers given?  The cartridge output gives you a guide to know how much phono stage gain you need.  The compliance will help to optimize tonearm matching.  You will get more help here if you provide that information.