Michael - I use an AKG condenser mic on a teeny weeny gooseneck with a glorified alligator clip for a mount on the mandolin, and of course a condenser mic does need phantom power. I mount the clip on a Tone-Gard, which I use when I actually want the mandolin to be heard. Because it's mounted to the instrument, it follows me around perfectly, no matter the motion on a stage. Because it's not a cheap mag pickup you won't need to crank the bass up to ten or the treble down to zero at or before the power amp for the mandolin or mandola not to sound tinny. Sorry I'm not near enough to it to get the model number, but the AKG website will show it. I recommend the Tone-Gard as well- their website will show it. Good product and support.
Carter Bannnerman