Having a great time doing the mods and looking ahead the the upcoming videos in the project. Got the R8 BOM parts sorted out. Just watched the video on tuning the GNFB and I see the R8 BOM has 2x 24K resistors and a recommended 330 Mica Cap. I'm not at my work bench right now, but where are these parts located in the amp? I assume they are on a PCB or several somewhere. It just was not shown in the video.
Thanks.
Mike.
It's the resistor marked Q in this picture. The other channel one is on the mirror image board on the other side of the amp. These can be replaced without removing the board and you solder the cap across this resistor.
All mods proposed by Stephe are OPTIONAL. I don't do this mod and my R8 sing. From my humble point of view, do no mods unless you fully understand what you are doing. If you want to know where this GNFB resistor is located, watch video #13 at 14:42 and you will see those parts (resistor and mica cap) between post 8 and 16 ohms on both ROUT & LOUT PCB.
Ok. I’m stupid. I totally do not understand what Stephe is doing with the GNFB parts she talks about in her video. They obviously make a difference. Is the a mod to the circuit somewhere, or replacing existing components somewhere.