@BobbyDing posted:
That's the PS/1 smoke unit, I typically use the PS/2 smoke unit as I'm adding the Super-Chuffer to manage the fan anyway. I swap out the two 16 ohm resistors for one 20 ohm closest to the stack. In the instance where I'm doing a Legacy conversion or TMCC with the smoke regulator, then I use an 8 ohm resistor.