Gyraf G14

Stereo Parallel-Passive Equalizer

Description

The G14 is a true tube, all passive, stereo equalizer. It consists 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.

G14 is as standard available as a 230V mains unit – other mains voltages will be made on request (at no extra cost)

The Gyraf Audio Gyratec XIV is a true tube, all passive, stereo equalizer. It consists 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 sharpness) is 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 the controllability of the midrange area, and with half a 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 useful tools in most situations, they are somewhat limited in use due to their simple construction. Our engineers wanted – as engineers tend to do – more of everything.

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

It is a truly passive design – based on switching a set of inductors and capacitors in and out of the 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 – of 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

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