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.
Full tube mastering equalizer
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 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.
I hope, you will feel the vibe of my uncle's old radio equalizer.
|Hard wire bypass||yes|
|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|
|Operating Level||+4 dBu nominal|
|Max output level||+19 dBu|
|Noise Level||-79 dB|
|Frequency response||20 Hz to 40 kHz, +/-0.3dB|
|Distortion (@ 20 Hz - 20 kHz)|
|THD+N||0.2% (1kHz @ +19 dBu)|
|VU Meters||Magic eye|
|Power supply||Linear, internal|
|Used for||Mastering, tracking|
|Tube set||6x6N1P, 2x6E2|
© 2015 IGS Audio