I just got hipped to this very cool mod: 10% Power Switch. Rob's diagram: I'm in the middle of a homebrew 5F6A, and I'm interested in incorporating it. I want to see if I've got the right values for the chassis mount resistors. Relevant details: It's a 2 x 10" (built in a BFDR sized cabinet) 2 8-ohm speakers run in parallel, so I'm using the 4 ohm tap on my OT Since my amp is 2 x 6L6, I'm just going to use 50 Watt resistors. I believe I should use 8 ohm for the "top" resistor, since I'm using an 4 ohm tap, not 8. But for the resistor going to ground, should I stick with 12 ohm? Divide by 2 and get 6 ohm?