Gyraf Gyratec G14-S

New – Closed Box
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The G14 is a true tube, all passive, stereo equalizer. Itconsist of five bands – each with 11 switchable frequencies, variable “Q”, andboost/cut selection. It also has an output level trim, and a “hard” relaybypass control.

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

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

This equalizer is a very extended version of the classicpassive 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. Ourengeineers 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 setof 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 semiconductorin the signal path – this is a real tube unit.

The inputs and outputs are – off course – transformerbalanced, 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

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