Tritonaudio FetHead Filter User Manual

User Guide
FetHead Filter
High-end microphone pre-amplifier.

General description

FetHead Filter is a Fethead version with a built-in 6dB/octave high pass filter with a corner
frequency of 220Hz. It is specially designed for microphones which exhibit an excessive
proximity effect / low frequency response, like long motor ribbon microphones. The
components which make up the filter are not directly in the signal path but are applied to the
components which set the gain of FetHead Filters amplifier, thus making it frequency
dependant. This way the sonic character which makes a normal FetHead attractive to the ear is
preserved.
FetHead Filter can be distinguished by a green dot below the TritonAudio label.

Low noise

Fethead uses low noise jfets configured as a double class a amplifier. Jfet's are among the
most quiet amplifying elements available today. The calculated noise figure of the FetHead
based on the jfet's datasheet is lower than we are able to measure. In the real world the noise
injected by a FetHead depends on the noise generated by the pantom power supply, if the
power supply is quiet, FetHead is quiet.
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