Astronic Equalizer

[opacheco]

Hi,

Do anyone have the schematic for any Astronic Equalizer like the more famous type A1671 ??

I am very intrigued about the used topology inside of these kind of unit and its relationship with well know classic Eq like Pultec, Altec, Cinema Engineering, Langevin and Lang PASSIVE Eqs.

Thanks for any anticipated comment
opacheco