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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...
Do anyone knows how this equalizer works?, are this equalizer balanced equalizer? this look like one balanced unit because we have two lines with passive components and one ground line too.
I have done a more clear schematic of the original schematic and if anyone want to check it, please contact to me to:
opacheco_hn@yahoo.com
I would like to analysis this schematic in order to get its transfer function and if someone want to join to this tasks, please let me to know too.
Thanks a lot anticipated
opacheco
Not sure if anyone is still working on this or interested, its been more than a decade — but multi-gang switches would solve your issue of sourcing pots with those specs, which you would populate with wirewound resistors designed as potential dividers with equivalent values to several steps of the potentiometers above.