JimDaBomb wrote:I see where the yellow marked one goes but are the other two red wires different? Does it matter which sides they go to?
Doesn't matter. One red goes to J6-1 and the other red to J6-4. The red/yellow wire goes to J6-2 or J6-3 (PCB ground).
JimDaBomb wrote:I'm also a little confused about how to wire in the on/off switch and IEC, and do I have to ground to the chassis somewhere?
ON/OFF switch: Connect pin 1 to the fuse, pin 2 to one side of the primary and pin 3 to the other side of the primary (the neon bulb is parallel to the primary winding).
Connect IEC safety ground to chassis. Per IEC standards this should be a dedicated chassis bolt and the wire should terminated with a crimped ring terminal. Then also run a wire from J6-2 or 3 (the spare) to the chassis, too. This should be the single chassis reference from the analog ground. Without it, a DMM from the PCB ground to chassis should be high impedance (eliminates ground loops).
Hope this helps! This is the method I use for all my amps these days. I do plan to eventually add better hookup diagrams for the GSG, and you've addressed some good questions.
Shannon