Joe Wicked,
It was Bill Hall from Hall Dielectric, not Thermatron, Faratron, et al. Sorry about that.
He did a nice one day course on the fundamentals of RF welding including design, tuning and maintenance.
We've got machines from all of em but our 30 and 50 KW's were custom jobs. My father had the 50's made so he could weld a waterbed mattress in one shot back in the 70's (the stories I've heard about the waterbed trade shows
). Our machines are mostly 27.12 Mhz but our big boys are half that, to reduce resonant frequencies.
We don't weld the rigid PETG type stuff. We RF weld flexible vinyl and urethane for the military and med industry.
At any rate, Bill Hall's class was informative for us. Maybe not if you're an RF engineer.
