Gyraf Audio Gyratec II Preliminary user's manual
Contents
1. ed wh W ou that operat as switchin tpu is tin F g cl 18 to monitor Ul input W dB of t 14dBm g the icks of th ter we reach the ou al output driver t stage The o utput is e fantastic take be audibl tput due to the passive action of the VU me tput level control responsib like the transformer balanced to get rid of potentially The output resistance is Le O L Le less than 1K Ohm or even long cab Le runs n the l7 for SO In use when turning on the recording channel please allow five to ten minutes to heat up the tubes The sound and the levels will change slightly within this period 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 315mA 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 J2. 14 set at spots that we worked quite a bit on getting right The low and the high bands are Shelving type controls the mid is a bell curve We ve purposefully avoided marking with nominal frequencies as this equaliser behaves somewhat different from standard models possibly confusing the user Bear with us on this using your ears as main tool for EQ setting is a good habit Next in line is the Compressor This is based on the electro optical principle that is the gain reduction element is a light dependent resistor audio signal con This The sidechain up to you EO before switch 15 wider range of sense the compressor Thi trolled by a light is how classics many others work but we use a giving a much input for that changes in propor like UA s LA2 LAS somewhat faster resist trol cont s is selected with the middle position the compressor is taken eit the input or the output of the equaliser section to decide if you want in effect the compressor before the EQ W Comp W which also doubles as a compressor bypass swil tion to the and LA4 among tive element ther from making it or the pre post tch in il t s The Compressor is fully adjustable giving you access to Threshold 7 at what input level the compressor starts working R
3. Denmark Europe Jakob Erland Gyraf Audio 14 November 2002 EU overensstemmelseserkl ing 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 Mikrofonforforst ker Fabrikat Gyraf Audio Model type Gyratec II Recording Channel 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 E S samt Lavspandingsdirektivet LVD Arhus Juni 2002 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 Microphone Pre Amp Make Gyraf Audio Model type Gyratec II Recording Channel 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 accordance with the EMC directive 89 336 EEC and the Low Volt
4. Gyraf Audio Gyratec II Recording Channel 2 4 6 8 10 12 14 16 18 20 N N TELAI OW FREQUE MID FREQUE OC esse se W HRESHOLD f ATTACK HELEA OUTPU P x i m 1 3 5 7 9 11 13 15 17 19 Gyraf Audio Gyratec II The all tube Recording channel Preliminary user manual 14 November 2002 Th ch e Gyraf Audio Gyratec is basically an all tube recording annel combining a microphone line preamp an equaliser and an optical compressor Although solid state electronics are used in th an e power supply and sidechain the audio signal is never touched by ything but tubes transformers and passives Very different from most tubed consumer type studio gear and very good for signal in Th tegrity e signal flow in the G2 is kept simple all functions are realised with only four double triode tubes the 5814 military type This tu be can be substituted with standard ECC82 or 12AU7A types so you don t have to worry about tube availability for the near future The input switch 1 selects between Instrument DI for e g Bass or Guitar Line Mic and Mic 48V The input impedance is 1K Ohm for the mic input 10K Ohm for the Line input and 1M Ohm for the Instrument input Mic and line inputs as well as the output are standard XLR pin 2 hot Mic48V is selected when and only when you use ph
5. age Directive LVD Aarhus June 2002 AW
6. antom powered condenser microphones The Microphone and line inputs are floating and transformer balanced an interface standard used in most serious audio designs Observe that if you attach unbalanced equipment you have to make sure that the cold in or output XLR pin3 is connected to ground XLR pinl The Instrument input on the front 19 is an unbalanced high impedance standard 1 4 jack handy for direct recording of bass keyboards or guitars I really like it on bass The gain switch 3 sets the level of the incoming signal in 11 steps The amount of useable gain is about 62dB mic in 50dB instrument in and 35dB line in The amplified signal is passed to the selectable Low cut filter 5 a soft 6dB filter at either 90Hz or 160 Hz or off The low cut filter is mainly used for reducing proximity effects in directional microphones or more generic getting rid of too boomy a low end or low frequency noises from insufficient shock mounting of microphones Our Equaliser section is a bypassable 2 three band variable frequency symmetrical boost cut type build around fixed Q passive 6dB filters The filters are optimised for gentle corrections so you shouldn t expect them to do anything bizarre like telephone typ sound or the like they re merely for sweetening the tone and flavour of your input signal Each band has six switchable frequencies 6 10
7. atio 9 how much it will do once it starts Attack time 11 how fast it will attenuate over threshold signals and Release time 13 the amount of time it takes to release the attenuation For most real world recording tasks this compressor works well but again like the EQ you shouldn t expect it to do something overly dramatic It is designed with signal integrity in mind not as an destructive effect The working of introduced This is cont level input position the compressor in this circuit actually the is monitored on gain reduct trolled by the Met output level or gives you an ide it internal u re ill yo st 3i L circuicy when headroom before anyi monii read thing nast the unit s toring me can ou Af se ter the tting input f problemai lowing plen ter switch is not and will the level driving your further line of equipmen tic hum recommend the middle in compressor circuit L for the fin Loating Loops driving al ll sorts of modern equipment won t be a problem ty headroom No er switch 16 tion the large VU meter allowing you gain reduction When set a of ing OVU you ll still to how hot you re running the have abou the 10 W lect tion y happens If you sel output stage condit te however ile recording OVU
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