Haha, awesome. I usually still get to a swap meet once or twice a year. Its nice to know a little more background. I built a Rife set a few years back based on an 812A, with variable carrier and can modulate any audio frequency. The output tube is a phanotron and the rig is wired so the output tube is part of a hartley oscillator circuit, that was what Rife et al. used.
I do not disagree with you that zappers can be useful, and especially given your backround its clear you're onto something. I didn't appreciate your background but now I do !
Are most of the frequencies people use in zappers in the audio range ? Thanks,