[TenTec] Matching impedance on Argonaut 509 microphone

Stuart Rohre rohre at arlut.utexas.edu
Thu Dec 1 15:08:49 EST 2016

The Argonaut 509 bridged the shift from true high impedance mics to 
moderate impedance if memory serves.

The best thing is to first try it.  There should be a mic gain pot 
somewhere in the rig in case you need more amplitude, but it may work 
just fine, if the mike is low impedance and is only loaded by the "high 
impedance" mike input.  It is not such a big deal in a lot of audio to 
match exactly, the impedance of two devices.  For example a speaker of 8 
ohms will work on 4 ohm output, or you could parallel two 8 ohm speakers 
to create a 4 ohm match.

Way back in my Tech/General days, mike inputs to AM rigs were 50,000 
ohms or so.

Later, the 600 ohm mike inputs became common.
Some computer type mics don't bother telling you what impedance they 
are. Go figure!

Stuart Rohre

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