Probably niether is ground. This is a condenser microphone and MUST be used with the amplifier and power supply in the body of the tube. Condenser mics use a high voltage bias and an amplifier with an input impedance often around 1 Gigaohm... very, very high impedance. You can probably reconnect the wires either way and test for operation. If both ways work, then polarity of the output signal would just be reversed is all. The impedance is so high that most meters would not register a voltage between the connections on the power supply but if yours will, connect the red to the positive.
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