For information on the effect of the impedance, I suggest you look at a recent thread, "What is the Sound of Impedence Mismatch?". I found it interesting.
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While we are talking slightly different circuitry here, my experience is that a microphone with an output impedance of 600 - 700 ohms loads perfectly acceptable into an appr. 2K impedance. As such, i would think that what you describe should work fine but am strictly guessing. I am not a "tube head" by any stretch of the imagination.
The only time that i see something working measurably less than optimally is if the input impedance of the load is very close to or less than the output impedance of the device feeding it. This is what is referred to as being "loaded down" and typically results in excessive current draw. As such, both sonics and measurements suffer, resulting in a situation that you don't want to deal with. Bottom line though is to try it and see. Sean