What is this circuit's purpose
I took some liberties with the layout of your schematic, and I wonder if it's intended to be an inline booster/amplifier which uses "phantom power" coming in through the output pin ...  







simulate this circuit &ndash; Schematic created using CircuitLab

Everything inside the box is your circuit. The rest is 'support' stuff I added to make it behave.
The circuit works even better if Q1 is a N-Channel MOSFET or a P-Channel J-FET - so maybe you could read the part number for us?



edit: updated after glen_geek's observation that your 33k is actually a 3k3.