GMT-47F

Microphones


This microphone has been specially designed not to be transparent.

It is the ideal tool for producers seeking  musicality and a strong character microphone.

Your best friend for big vocals & instruments recordings

 

 

Specification

  • Cardioid microphone
  • Historic k47 capsule 34 mm single backplate
  • Membrane composition: 3-micron Mylar, sputtered with Gold
  •  Transistor jFET classe A (selected)
  • Vishay Sprague condensateur
  • Lundahl Output Transformer Iron core
  • SPL 130dB
  • Sensitivity: 11mv/pa
  • Equivalent noise = 12dBA
  • Power Requirement: +48v Phantom power
  • Impedance 200 Ohm
  • HandMade in France

The Griffon GMT-47F includes

  • Elastic shockmount
  • Wood case
  • Documents

INSIDE GMT-47f  MICROPHONES

Own proprietary Capsule type K47 single backplate Mylar gold diaphragme


///////////////////// The Good condensateur choice ///////////////////

 

After studying, selecting, and listening a ton of possibility of high quality capacitors and all prices ranging from 1.5 € to more than 50 € ...
MKP capacitor, MKT, MKS, wax paper, oil, silver, ect ...
But something was wrong !
it was too clean! too HiFi! ! not enough color !


And so i found it !
The nightmare of audiophile !

the Vishay sprague  aluminum polarized capacitor is revealing to be the most interesting !

Color! distortion! non linearity!

And it adds musicality , tone , and smooth flavor

 


Lundahl is probably the most renowned audio transformer manufacturer, the choice is important, so we chose the most suitable transformer, but beware we want a transformer that has a big color, grain, a particular signature.

So we chose the LL1940 series
Specially manufactured for audio tubes
Conventionally, this type of transformer has a metal core lamination for minimum distortion and maximum transparency. For the LL1940 we have chosen a silicon iron C-core with approx 10 times as high distortion compared to mu metal to add more "transform character" to the signal.


DEAD TUBE SIMULATION  ®

Violet =  Flat

Green = Dead Tube 

Inside the GMT-47F microphone we have an interesting colors sound option !

OFF = flat normale fréquence response

OLD = More vintage u47 sound !

we moded the smooth frequency response of an used NOS tube