From your post, I wondered what you meant by "source resistance" - microphones are measured in impedance (varies by frequency), and what was the source - the mic or presumably, the amp you want to connect it to.
Googling for CZN-15E, I saw that the unit has an FET impedance converter built in, and being an active device, you have to bias it.
This link shows a simple schematic of the unit (albeit the "-P" model). You were inquiring about the 2.2k ohms resistance - this is the load resistance (Rl) in this typical schematic. That is, it is an external resistor.
DC Beta (common emitter) is the collector current divided by the base current, = Ic/Ib. Beta depends on how you bias the transistor (and frequency) - there is no absolute number for a specific transistor. Beta is rarely specified; transistor specify hFE measured at various collector currents instead of DC beta.
Here's the spec for an NTE replacement for your 2N3904 transistor.
Note that "hFE" is the DC current gain, where as "hfe" is the small signal current gain. I tended to mix them up when taking notes in class as I tend to print in all caps
edit: I type too slowly - 4 posts since I started writing this!
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