[Elecraft] K3/K2 - Microphone Question

[George & Jan]

Lee,
In broadcast & pro-audio (probably other services) - microphones aren't 
impedance matched. Normally you want to have the microphone load impedance 
(amplifier mic input) at least 10 times the microphone's characteristic 
impedance. My K3 schematic shows a 10k input pad-out resistor to a 100k 
feedback resistor so the 600 ohm microphone should have no issues.
George - AI4VZ

Just came into possession of an ElectroVoice PL91 microphone.  The specs 
says it has 150 ohm impedance.  I think that the K3 would like to have 600 
ohms.  I would imagine that this could be used on the K3 if you used an 
impedance transformer.  Comments?

Lee - K0Wa