Gyraf Audio G10 Stereo Varible-Mu Compressor

The G10 is a true tube stereo compressor based on the classic variable-mu principle. This method - controlling the gain by altering quiescent current in differential tube pairs - is much faster, but also significantly more complicated than the optical method. The speed of gain-change is primarily why the vari-mu principle was widely used in early broadcast limiter devices such as the Fairchild 670 or the Universal Audio 176, but the sonic byproducts of this topology are the main reasons why it is so loved today. The controls on the G10 are as follows: The “Input Level” pot is positioned right after the input transformers, thus allowing you to control the input level, the “drive” for the compressor. The “Threshold” controls at what level the compression will set in. Turning counter-clockwize will select a lower start point, resulting in more compression. When turned fully clockwize, the compression is deactivated. The “Ratio” controls the amount of compression in relation to changes in