Above, a ‘distortionless’ equalizer circuit circa 1961 as designed by one Carlos Moura. Separate bass and treble boost functions (2 frequencies each) and bass and treble loss cut. I do not know the range, frequencies, or insertion loss. Can anyone tell me if/when this was manufactured, and by whom?
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3 replies on “Interesting Passive EQ circa 1961”
I’d plug it into a Spice program and see what it does. You’re running with the big dogs when you get into filter design, which is what this is.
Gravodisc is a record studio in São Paulo – Brazil and still exists.
This unit seams to be maded for use in this studio and not comercialized I think.
Rgs
Filipe Zanella
Well sourcing those pots might be tricky…