Gyraf G9

Dual Microphone Preamp

Description

The G9 is a dual true tube microphone preamp. It’s a simple, yet powerful unit, based on a variable-gain input tube stage driving a tube SRPP output stage – No silicon in signal path.

G9 is as standard available as a 230V mains unit – other mains voltages will be made on request (at no extra cost)

Tech
The Gyraf Audio G9 Tube Preamp is floating, transformer balanced at the line and mic inputs, as well as on output. Input impedance for the mic input is some 1KOhm, the line is some 10KOhm, Inst. more than 2MOhm, and output impedance is less than 1K Ohm. Although semiconductors are used in the Gyraf Audio G9, they’re confined to power supply functions. At no time will your audio pass through anything but transformers, tubes, and passives. So it’s all about REAL tube audio here.

Controls
Controls of the Gyraf Audio G9 include the input level switch, the output level pot, the input switch, the low-cut switch and the phase switch. The input level switch – in eleven steps – sets the raw gain of the first stage, thus allowing you to control the input level, the “drive” for the preamp. The input switch is used to select either Line, Mic, or Mic-with-P48 as input for the Gyraf Audio G9. If you insert a jack at the front panel socket marked “Inst.”, this will break the signal selected on the input switch, and instead, have a very-high impedance instrument input – perfect for DI of e.g. bass guitar. A gentle highpass filter of either 80 or 160Hz is activated by the “Low-cut” switch, and the Gyraf Audio G9’s absolute phase can be reversed using the “Phase” switch.

Gyraf Audio G9 Tube Preamp Features
A simple yet powerful unit, based on a variable-gain input tube stage driving a tube SRPP output stage
Input level switch – in eleven steps – sets the raw gain of the first stage
Output level pot attenuates the signal to the output stage
Input switch is used to select either Line, Mic, or Mic-with-P48 as input for the unit
“Low-cut” switch activates a gentle high-pass filter of either 80 or 160Hz
“Phase” switch is used to reverse the unit’s absolute phase
The unit is Floating, transformer balanced at the line and mic inputs, as well as on output
Semiconductors are used for power supply functions only
Audio passes through transformers, tubes, and passives only

Gyraf Audio G9 Tube Preamp Specifications
Input Impedance: Mic Input; 1K Ohm, Line Input; 10K Ohm, Instrument; > 2M Ohm
Output Impedance: < 1K Ohm
Controls: Input Level Switch, Output Level Pot, Input Switch, Low-Cut Switch & Phase Switch
Power Requirements: 230 V

Gyraf Audio G9 Tube Preamp Includes
Gyraf Audio G9 Tube Preamp
Power Cord
2 Year Warranty

 

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