I wonder if I should use a pair of tubes or FETs. Any idea?
As somebody who wants to get the sound of a guitar recorded well I wouldn't worry too much about the electronic principles that are used inside the mics (as little as I worry about what kind of electronics they use in my computer as long as it does what it is supposed to do);
but there a few factors that might of prime importance:
The mic must be
- quiet (low self noise). This is one of those parameters that can't be too good!
- fast (have a quick response to all transients - that rules most of the dynamic mics out, apart from ribbons). Quite important to catch the specifics of the instrument you are recording.
- working well with the usual preamps (that rules some of the vintage exotic ones needing special power supplies or connectors, at least for nonprofessionals)
- sounding well (this is certainly a subjective judgement)
Personally I don't believe in the necessity of flat frequency response, because that is something that is blurred under real recording conditions quite a bit, but one has to understand the kind of colourations that every mic inevitably imparts in its effect to the guitar sound (e.g. the bass boost through proximity effect that is more prominent in some mics and less in others).
So instead of asking yourself what sits inside the mic electronics it is more important to know how a mic actually sounds with your guitar. And don't forget, the preamp does it's own part in what sound ends up on your recording.
I myself came to love ribbon mics more and more for classical guitar, and here the preamp is even more crucial than else, because one needs a lot of very, very clean gain and a suitable impedance for ribbons. And the best: I don't need to worry about whether they are FET or Tube, because they don't have any active electronics at all (at least the traditionally built ones).
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