Boards are all assembled for the Blue Panel.  Left to right:

• CGS113 Serge Wave Multipliers
• CGS65 Tube VCA/Timbral Gate x2
• CGS67 Active Real Ring Modulator
• CGS81 Voltage Processor x5.5
  • 2 DC processors with bias and attenuation
  • 2 AC coupled outputs with attenuation
  • 4 to 4 matrix mixer
  • 4 to 2 matrix mixer

Some boards lack power connectors – power will be jumpered to them.  The CGS81 boards have a power connector at both ends, since they can be split in two (see the last one in the picture).  Only one is needed, if not split.  The CGS81 is a generalized mixer board that can be built in many ways.  I modified it slightly to fit a capacitor for AC coupling in the output module.  And I modified it slightly for the matrix mixer application.  As previously mentioned, just two of the three Serge Wave Multipliers are assembled on the CGS113 board.

And yes, those are tubes on the CGS65 boards!  Russian made.