|One interesting note about the PPG 100 series modular
systems is that several modules were "grouped" onto larger
panels. One particular example is the VCOs. In Moog systems,
the driver (901A/921A) and the slave VCOs (901B/921B) are
discrete modules. In the 100 system, the driver and three
VCOs are included on one larger panel, though made to look
like individual modules! The VCOs are labelled 1-3 and the
advantage to them being on one panel is the integration of
several functions that would otherwise require patching.
||Much like the Moog 900 series, the PPG 100 system included
both full height and partial modules. Oddly, the partial
height modules were sometimes included in rows alongside the
full modules with a filler strip below them.
The 100 Series used metal threaded jacks, whilst the later
300 Series system used plastic nosed types like the RSF
|As is apparent, the panel legends for the PPG 100 system
are all in German, though this would not present much
impedance to anyone familiar with a Moog modular on the
The system also featured a number of instances of the
classic ITT Schadow mechanical "eye" switches which required
no power but give a very clear indication of their status,
something often missing on push-buttons!