Gyraf Audio Gyratec X (G10) - Stereo vari-mu compressor

New – Closed Box
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The G10 is a true tube stereocompressor based on the classic variable-mu principle. This method –controlling the gain by altering quesient current in differential tube pairs –is much faster than the optical method. The speed is why it was widely used inearly limiter devices such as the Fairchild 670 or the Universal Audio 176, butthe sonic byproducts of this topology are the main reasons why it is so populartoday.

The controls on the G10 are asfollows:

The input level pot is positionedright after the input transformers, thus allowing you to control the inputlevel, the “drive” for the compressor.

The Threshold pot controls atwhat level the compression will set in. Turning counter-clockwize will select alower start point, resulting in more compression. When turned fully clockwize,the compression is deactivated.

The Ratio pot controls the amountof compression in relation to changes in the input level, that is, for the partof the signal that exceeds the threshold value that is set. Setting Ratio fullycounter-clockwize will deactivate compression.

The Attack pot controls the timethe compressor takes to react to a rising input level.

The Release pot controls theamount of time it takes from the input signal falling below threshold, to thegain reduction being returned to unity.

The Output level pot controls thesignal level to the output driver stage and the output.

The Bypass switch bypasses theunit completely. The hard way. – A relay simply takes out the activeelectronics and shorts the input to the output connectors.

The G10 is floating, transformerbalanced in and out. Input impedance > 10K Ohm, output impedance < 1KOhm.

It is based on a very shorttrue-differential signal path from input to output, using very, very tightlyselected PCC189 (7ES8) remote-cutoff dual triodes for the VCA stages, and E88CC(6DJ8) low-noise triodes as cathode followers for the output stage drivers.Both tubes are still fairly easily available throughout the world.

Although semiconductors andopamps are used in this unit, they’re confined to powersupply and sidechainfunctions. At no time will your audio pass through anything but transformers,tubes and passives. So we’re talking REAL tube audio here..

G10 is as standard available as a230V mains unit – other mains voltages will be made on request (at no extracost)