Hello everyone,
I’m sure this has been covered before, but I couldn’t find a quick answer: Why does the BOM for the Studer 169 EQ list dual-gang potentiometers for all controls, when the only pot that actually makes use of the dual-gang is P4? As for P2 and P3, pin row 1 and row 2 are directly connected on the PCB. The low shelf pot (P1) even uses the front row of pins only, i.e. there’s no path going from the second row. See attachment. So why use dual-gang pots?
If I’m right and we can replace them by simple 1-gang pots, do P2 and P3 have to be the same value as the dual-gang variants (i.e. 10k)? Or do the dual-gangs work like (variable) resistors in parallel here? Then the value for a 1-gang pot would have to be 5k instead of 10k, I guess [ R
total = R1 * R2 / (R1 + R2) ]. Or am I completely confused now?
On another note, how can I make use of the empty space on the PCB? This is all connected to ground, isn’t it? So if I want to install additional caps, for example, how do I prevent them from being connected to ground, when I drill some holes in there?
Sorry for the newbie questions, I’m only asking because I want to learn more about this.

Thanks,
Claudio