Tilt n Bands

Full tube mastering equalizer

From IGS:

Once when I was a little boy, I heard my uncle's equalizer which he built into his stereo. The sound was incredible. I still remember it to this day. Three potentiometers gave it a sound that I'd never heard before. I couldn't stop listening to the sound that his compact player made.

My uncle Chris
I asked my uncle for the diagram and he drew it with a pencil on a piece of paper. I quickly learned the schematic by heart and as an electronic engineer amateur, I have repeatedly built the hi-fi amplifiers using the schematic. The EQ sounded implausible each time.

After many years
After many years I decided to make a studio device based on my uncle's schematic. I improved the arrangement by adding a transformer balanced tube stage. The Tilt turned out to be a cool addition too. This vintage circuit is very useful in any mastering application. I hope, you will feel the vibe of my uncle's old radio equalizer.

BASIC FEATURES

• Hard wire bypass 
• Q factor 0.5 to 5
  

INPUT & OUTPUT

• Input Impedance (balanced) 10k Ohm
• Output Impedance (balanced) 600 Ohm
• Audio transformers IGS Custom on input and output
  

LEVELS

• Operating Level +4 dBu nominal
• Max output level +19 dBu
• Noise Level -79 dB
  

BANDWIDTH

• Frequency response 20 Hz to 40 kHz, +/-0.3dB
• DISTORTION (@ 20 HZ - 20 KHZ)
• THD+N 0.2% (1kHz @ +19 dBu)
• Crosstalk >70dB
  

FRONT PANEL

• VU Meters Magic eye
  

POWER

• Voltage 230/115
• Power consumption 64W
• Power supply Linear, internal
  

PACKING BOX

• Shipping weight 11kg
  

OTHERS

• Used for Mastering, tracking
• Tube set 6x6N1P, 2x6E2