Here's what I came up with for the K3 network. Two 47K plus two 1200 and a 1600 to replace the 90K + 4000pF sandwich in the original.
I would have liked to use a small ceramic 5100pF cap, but the closest I had on hand was a big 2,000V 5100pF film cap.
It's tempting to coat these networks in epoxy or silicone, but I'm afraid I may need to tinker with them to get the set running properly.
