I am rounding up the components to build a tube microphone out of a V67 using the Royer schematic(actually, I have a buddy/electronics tech who will actually wield the soldering iron). Anybody been down this road? Any pitfalls you would care to share? I figure if I end up with a piece of crap, I'm not out much and it should provide a few dollars worth of entertainment if nothing else. Wish me luck!