Advanced Audio - AKG C-24

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This microphone comprises two completely separate high quality studio condenser

microphone systems which are arranged one above the other and have the function

of receiving sound from a given direction. This direction from which the systems

receive sound can be adjusted by:

- rotating one system with respect to the other (base angle)

- rotating the entire microphone assembly (XY,MS stereo techniques)

- selecting nine different directional characteristics for each sytem

(cardioid, omni, figure eight, and intermediate positions.

If we take a look at the circuitry of the C24 i.e. one channel, and compare it to the C12, then it all becomes much clearer.

1 - Grid Biasing Arrangement
The "Grid" biasing arrangement is quite different in both microphones i.e. The C12 uses a "Specific" feed from the associated N12 power supply unit, for "Grid Bias", whereas the C24 is "Self Biasing", through the use of a 200M ohm "Grid" resistor and a 27k ohm "Cathode" resistor, together with the associated 33uF "Cathode" decoupling capacitor.
These differences having a very noticeable effect on the "Slope" of the valve, and therefore it's "Transfer" characteristics. Also effecting the "Low End" response/characteristic of the microphone.

2 - Output Coupling Capacitor Value
The output coupling capacitor, to the matching transformer, is of a different value i.e. A 0.5uF capacitor is used in the C12, as opposed to a 1uF capacitor in the C24.
Thus changing the "Low End" response, by a "Whole Octave" at the -3dB point i.e. There is greater "Bass Extension" on the C24, compared to that of the C12.

3 - Valve Anode Decoupling
The valve anode, of the C24, is decoupled to earth via a 100pF capacitor.
Thus changing the quality of the extreme "Top End" and "Transient" response of the microphone.

See product documentation

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