Here's the Purple Wonder. This little thing sure has made the rounds, I've loaned it out to at least five different people over the years, but mostly to use as a preamp. This was an important stepping stone because it showed that we could make the Kugelis circuit function off one of our standard power transformers.
I actually have one of Doc B's first attempts sitting around, though it has been well gutted. I'll have to grab some photos of it.
