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Gyraf Audio Gyratec XIV (Demo Deal) – No Longer Available

Parallel-passive stereo tube equalizer

Product Description

The Gyraf Audio Gyratec XIV is a true tube, all passive, stereo equalizer. It consist of five bands - each with 11 switchable frequencies, variable “Q”, and boost/cut selection. It also has an output level trim, and a “hard” relay bypass control.

The two channels are linked - controlled with one set of knobs. The “Q”s (filter sharpnes’es) are rather low when boosting, but higher at cut - approaching a notch on extreme cut settings. This is both a side-effect of the applied passive technology - as well as quite desireable in situations where sound integrity is the paramount factor.

The frequencies are selected with special attention to controlability of the midrange area, and with half an frequency-range overlap to the adjacent bands.

This equalizer is a very extended version of the classic passive inductor/capacitor type filters, the most famous being the “Pultec” units. Even though the classic versions are usefull tools in most situations, they are somewhat limited in use due to their simple construction. Our engeineers wanted - as engeineers tend to do - more of everything.

So we came up with the parallel-passive design, the G14.

It is a truely passive design - based on switching a set of inductors and capacitors in and out of circuit - combined with an E88CC (6DJ8) tube-based makeup gain/output stage. Not a single IC’s or semiconductor in the signal path - this is a real tube unit.

The inputs and outputs are - off course - transformer balanced, for trouble-free interfacing to the outer world.
  • Input impedance - around 5K Ohms, transformer balanced
  • Output impedance - ~1K Ohms, transformer balanced
  • Max boost/cut - ~10-12dB, depending on “Q” setting
  • Gain trim ~+6 - -20dB
  • Each band individually hard-bypassable
  • Channel tracking within ~1dB

Frequency markings are:
  • Low: 35-48-60-70-80-100-120-160-190-220-270Hz
  • Low mid: 180-230-280-330-400-430-490-550-590-650-750Hz
  • Mid: 500-570-700-800-900-1K-1K1-1K3-1K5-1K8-2K1 Hz
  • High mid: 950-1K2-1K4-1K7-2K-2K5-3K-3K5-4K2-5K-6K3 Hz
  • High: 4K5-5K6-6K5-7K8-9K1-12K-14K-16K-18K-20K-22KHz

Product Specifications

Condition Demo / B-Stock
Tube or Solid State Tube
Channels Dual-Channel
Chassis 19-inch Rack-mount
Rack Spaces 3u
Digital I/O No
EQ Type Parametric

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I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.