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It is really simple. It is a modulated RF power amp with a controlled ionic discharge.
Please note that a careful building in a steel or aluminium chassis is strongly recommended. The part with the power tube and teslacoil is covered with perforated steel. The holes are 3 to 6mm. There is a lot of heat coming out.
I have divided the tweeter in two sections. One section for the tube and teslacoil and one section for the rest. If I had a second chance I prefer 3 sections to separate power and amplification because it was not so easy to get the noise from the powersupply away from the amplifier. The sections are separated with a aluminium plate. I use this plate also as heatsink for the transistors. In the perforated cover I cut a 50mm hole over the place were the teslacoil is positioned. The electrode of the teslacoil comes out of this hole. Over this hole I put a ball made of 2 teasieves, which I soldered together. In that ball you have to drill a hole ( 6mm dia.) in the height of the electrode. See the ball picture how this looks like. That's the mechanical part. The potis and connectors are placed on the rear. See rearpicture. The wireing is like in old tubeamps "free air". Be careful with the grounding otherwise the speaker gets hum !
Article by Ulrich Haumann at http://www.plasmatweeter.de/eng_plasma.htm
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Homepage, Added: Mar 10, 2006
http://www.plasmatweeter.de/eng_plasma.htm
