Manual
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1. This compressor is based on two sets of SRPP gain stages with no feedback using selected 5814 dual triodes for both input and output stages These tubes can be substituted with standard ECC82 or 12AU7A types that are still fairly easily available today so don t worry too much about availability for the future These preamp tubes should at least last for a couple of years and often much more than that Although semiconductors and opamps are used in this unit they re confined to power supply and sidechain functions At no time will your audio pass through anything but transformers tubes and passives So as with the rest of our product range we re talking REAL tube audio here Important notice Do not open this unit as there are really high potentially lethal voltages present inside Refer servicing to qualified personnel You can safely remove the four rubber feet if you wish to mount this unit in a tight rack please save the feet for future use NOTE The feet are the ONLY part that can safely be removed Do not loosen any other screws This unit operates from 220 230V AC consumes about 25W and the mains fuse is a 630mA slow blow type For further questions comments and wishes please contact Gyraf Audio e mail users gyraf dk Telephone 45 86 11 52 77 Address Gyraf Audio Feedback Recording Haraldsgade 27 DK 8260 Viby J Denmark Euro2. accordance with the EMC directive 89 336 EEC and the Low Voltage Directive LVD Aarhus June 2002 aon n AUS Z
3. Gyraf Audio Gyratec lll Electro optical Stereo Compressor GYRAF AUDIO GY RATEC rw Oe H 4 i HRESHOLD mer OUTPUT Ni Sieg POWEL 1 2 3 4 8 9 Gyraf Audio Gyratec III Electro optical stereo tube compressor Preliminary user manual 23 January 2004 The Gyratec is a true tube stereo compressor based on the electro optical VCA principle This method controlling the gain by the means of a light dependent resistor is not as fast as the vari mu method but much more subtle sonically This principle is known from e g the classic Universal audio LA2 LA3 and LA4 compressors although we use a considerably faster opto giving you a wider range of control as well as a better stereo tracking In use First of all when turning on the compressor allow five to ten minutes to heat up the tubes The sound and levels will change slightly within this period The controls on the Gyratec are as follows The inputs are transformer balanced 10K Ohm bridging type so we don t load the output of the previous stage too much The input connectors are standard XLR jacks pin 2 hot The bypass function switch 1 bypasses the unit completely for reference The hard way A relay simply takes out the active electronics and shorts the input to the output XLR s If you wish to use the unit as a straight line preamp but with bypassed compression the compress
4. ion can be fully disabled by turning the Ratio knob 3 fully counter clockwise or turning the Threshold pot 4 fully clockwise The input level control 2 is positioned right after the input transformers allowing you to control the input level for the first gain stage the drive for the compressor The Threshold pot 4 controls at what level the compression will set in Turning counter clockwise will select a lower start point resulting in more compression When turned fully clockwise the compression is deactivated The Ratio pot 3 controls the amount of compression in relation to changes in the input level that is for the part of the signal that exceeds the threshold value that is set Setting Ratio fully counter clockwise will deactivate compression The Attack pot a rising inpu 6 controls the time the compressor takes to react to level ct ct The Release pot 7 controls the amount of time it takes from the input signal falling below threshold to the gain reduction being returned to unity The Output level pot 8 controls the signal level to the output driver stage and the output The output impedance is less than 1K Ohm and is like the input floating transformer balanced The VU meter 5 is always monitoring the ongoing gain reduction allowing you to check the state of things at a quick glance
5. pe Jakob Erland Gyraf Audio 14 November 2002 EU overensstemmelseserklaring Undertegnede erklarer herved at fdgende apparat overholder beskyttelseskravene i R dets direktiv 89 336 E F om elektromagnetisk kompabilitet EMC samt Lavspandingsdirektivet LVD Identifikation af apparat Kategori Audio Compressor Limiter Fabrikat Gyraf Audio Model type Gyratec III Electro optical tube compressor Navn og adresse p underskriveren Jakob Erland Gyraf Audio Feedback Recording Haraldsgade 27 DK8260 Viby J Standarder anvendt til grundlag for erkl ingen EN 55013 EN 55020 EN 61000 3 2 EN 61000 4 2 og EN 60065 Bemarkninger CE market angiver kun overensstemmelse med EMC direktiv 89 336 EQS samt Lavspandingsdirektivet LVD rhus Juni 2002 a C A gt l 5 aA G K DAU ZY Declaration of EU accordance I the undersigned hereby declare that the following device observes the protectional demands stated in the Council s directive 89 336 EEC about electromagnetic compatibility EMC and the Low Voltage Directive LVD Identification of device Category Audio Compressor Limiter Make Gyraf Audio Model type Gyratec III Electro optical tube compressor Name and address of the undersigned Jakob Erland Gyraf Audio Feedback Recording Haraldsgade 27 DK8260 Viby J Standards founding this declaration EN 55013 EN 55020 EN 61000 3 2 EN 61000 4 2 and EN 60065 Remarks The CE mark only states
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