Kingston, 48v of phantom power is not enough to feed the tube in a tube mic, such as NTK, which uses a power supply and a multi-pin cable to feed the power back to the mic. While a little cumbersome, this setup makes a tube mic very useful for feeding the signal to a board or recorder that doesn't produce phantom power. In general, tube mics are used to produce "warmth" which is really selective distortion. Most people use tube mics primarily for vocals, and while essential as a piece of your mic cabinet, they're not the most versatile mics ever made. I know some people use them for instrument mics, but I haven't had good results using them for that application.
If you're just starting with condensers, I would consider some affordable non-tube condensers for my first choices. My choices are Studio Projects C1/C3 for voice, and Oktava MC012 for instruments. You could get both of them for a little more than half the price of an NTK. Other good affordable mics which I have not used but are highly recommended by experienced engineers on this board include AT4033, a versatile workhorse, and Marshall MXL603, a very inexpensive small diaphragm mic, like the MC012, good for instruments and overheads.
I'm not saying I don't like NTK. I own one and I like it a lot. Only that for my first condensers, I would choose ones less expensive and more versatile.-Richie