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Gyraf Audio Gyratec II
The all-tube Recording channel....
Preliminary user manual, 14. November 2002.
The Gyraf Audio Gyratec II is basically an all-tube recording
channel, combining a microphone/line preamp, an equaliser and an
optical compressor. Although solid state electronics are used - in
the power supply and sidechain - the audio signal is never touched by
anything but tubes, transformers and passives. Very different from
most "tubed" consumer-type studio gear, and very good for signal
integrity.
The signal flow in the G2 is kept simple; all functions are realised
with only four double triode tubes - the 5814 military type. This
tube 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
1
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Summary of Contents for Gyraf Audio Gyratec II
- Page 1 Gyraf Audio Gyratec II The all-tube Recording channel..Preliminary user manual, 14. November 2002. The Gyraf Audio Gyratec II is basically an all-tube recording channel, combining a microphone/line preamp, an equaliser and an optical compressor. Although solid state electronics are used - in the power supply and sidechain - the audio signal is never touched by anything but tubes, transformers and passives.
- Page 2 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 phantom powered condenser microphones. The Microphone and line inputs are floating and transformer balanced - an interface standard used in most serious audio designs.
- Page 3 resistor, controlled by a light that changes in proportion to the audio signal. This is how classics like UA's LA2, LA3 and LA4 - among many others - work, but we use a somewhat faster resistive element, giving a much wider range of control. The sidechain "sense"...
- Page 4 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 J. Denmark Europe Jakob Erland Gyraf Audio 14.
- Page 5 (EMC) samt Lavspæ ndingsdirektivet LVD. Identifikation af apparat Kategori: Mikrofonforforstæ rker Fabrikat: Gyraf Audio Model/type: Gyratec II Recording Channel Navn og adresse på underskriveren: Jakob Erland Gyraf Audio Feedback Recording Haraldsgade 27 DK8260 Viby J. Standarder anvendt til grundlag for erklæ ringen: EN 55013, EN 55020, EN 61000-3-2, EN 61000-4-2 og EN 60065.
- Page 6 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.
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