--- In Doepfer_a100@yahoogroups.com , Brandon Daniel <bdu@f...> wrote:

> On Thu, 12 Jun 2003, Paul Schulz wrote:
>
> > Yes, that´s right. The early versions ("Blue Meanie" and "Grey

Meanie")

> > had a Moog lowpass filter clone.

Maybe this has already been covered,
but, the Moog filter is the 4012 and
the non-Moog is the 4072. Personally,
the 4072 - when done properly is actually
the more interesting of the two filters.

4072s suffered from a trucated frequency
response due to miscalculated resistors.
A simple mod to the 4072 restores the full
frequency showing off the glory of the 4072.

Why build the 4012 anyway, it is just a moog
clone to begin with.

I uploaded a schematic for the 4072 to files section.

Ethan