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*How many ohms is a typical vacuum tube hi-Z microphone? *How many ohms is a typical hi-Z microphone for old tube transceivers? *How about those microphones with the old crystal element, are they not "really" high impedance? *How about those microphones with the old crystal element, are they "really - really" high impedance? Impedance is the resistance to a non-DC current. It is the equivalence to resistance which a DC current and both are measured in ohms. Impedance is the resistance to a non-DC current. It is the equivalence to resistance with a DC current and both are measured in ohms. In an AC current we speak in terms of impedance rather than resistance. Impedance is more involved than DC resistance because it is actually the combined effect of capacitance, inductance, and resistance on a signal. Audio microphones in general are divided rather loosely into three classes of impedance.*Low ... 600 ohms or less*Medium ... above 600 ohms to 10K ohms*High ... above 10K ohmsOhms resistance measurement with an ohm meter ...more...Microphone impedance cannot be determined with an ohmmeter because the ohmmeter uses a very low DC current, where as impedance is the opposition to the follow of an AC current. You can use the ohmmeter to help determine what some of the microphone pins are for, such as which pair are for PTT, however, you cannot use to tell what impedance the microphone is rated. An impedance measurement would involve the use of a tone generator and oscilloscope and would not be exactly precise.==Related==* [[Dynamic and Condenser Microphones]]* [[Microphone and Line Input]]