This is a breadboard style prototype board for the 500 & 51x series format. 
 
The +-24V (51x) fingers can be cut off if this will be used for a 500 series project. 
2.54mm footprint grid
±16V rails at the top and bottom with connection points
±24V power points at edge card connectors (no power rail connection points)
Audio ground rails with connection points
Power ground rail with connection points
Three footprints for DPDT switches