Bryan,
The stock volume pot on the GG doesn't track well, at least the one I had didn't.
I have a TKD in the preamp I use at work. I named it the little guy as it has only 1 tube and a small footprint. I used to have a TKD in my main pre but it gave up the ghost about 6 months ago, one of the reasons I started futzing with the LDR's.
I still have more experimenting to do. I am closer, it's sounding very good and I think I have the impedances close as it's not creating too much noise when I turn it up. At first I was getting too much noise from the input tube, I believe this was because the Zout of the LDR was pretty high.
Part of me wants to try the Slagleformers. I've read about them for years and he now has a 28 tap model and I have a nice pair of 32 position Daven switches...