From IGS Audio
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
- yes
- Q factor
- 0.5 to 5
Input & Output
- Audio transformers
- IGS Custom on input and output
- Input Impedance (balanced)
- 10k Ohm
- Output Impedance (balanced)
- 600 Ohm
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
Power
- Voltage
- 230/115
- Power consumption
- 64W
- Power supply
- Linear, internal
Packing box
- Shipping weight
- 11kg
Front Panel
- VU Meters
- Magic eye
Others
- Tube set
- 6x6N1P, 2x6E2
- Used for
- Mastering, tracking
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