Moog Sonic six knobs

[matt wilson]

Ken MacBeth wrote:

> Gerry! yer buildin' a Sonic Six, so am I! From the
> recent schemats I've downloaded, the machine is simple
> but clever, mostly all the parts can be had. Are you
> looking to make a clone, hence the knobs, or what? do
> you think that the filter is your bulk standard
> transistor model or something else?

hey folks check this out from the analog heaven list:

clip:

> > The oscillators use a uA726, as does the Minimoog with the later
temperature stabilized oscillator card.  Should be
stable enough.
> >
> > The Sonic Six was the synth of choice for Bob Moog for a long time,
even though he had little to do with its design.
> >
>
> at Bob's address at the audities booth at NAMM, i asked him about his
input to the
> design. (mc was there, handling the mic [mc the "mc"! right on!]) bob
said
> that basically moog just installed their filter into musonics sonic 5,
and redesigned
> the case based on an early mini drawing (see it in vail's book).  does
this mean
> the ua726 design came from the musonics (?!), or did bob just forget
that
> moog had redigned the *oscillators* as well??
>
Yes, the uA726 design came from Musonics (!).  None of the synths from
the Trumansburg R.A. Moog era used the
uA726 and the S6 was the first Buffalo Moog Music synth to use it.

The S6 was largely Gene Zumchak's design, who was a former R.A. Moog
engineer.  The original filter in S5s and early
S6s was a diode ladder design to get around the transistor ladder design
patented by Moog; this was before the merger
of Musonics and Moog.  S6 serial numbers 1265 and up had the Moog
transistor ladder filter.

The S6 is unique in that it uses a single uA726 shared between the two
oscillators, whereas on the Polymoog and the
later Minimoog oscillator cards there was a uA726 per oscillator.
Tempco resistors were the norm on the early Minimoog
oscillators, 921 modules, Satellites, and Minitmoogs.  Starting with the
Micromoog, a tempco combined with a 3046
transistor array provided a temp compensated current source with parts
that are easier to source.  This was the standard
design in later Moogs up until the CEM-based Memorymoog."

end clip

it looks like there are two sonic 6 filters, just like ken was asking.
so which is it, guys?

matt (who need two original knobs for his sonic six....)


--
MATT WILSON is ODYSSEY SOUND
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