This would explain the cell with variable distance utility too...
And this might also explain the tube cuts... To reach precisely the same capacitance for each tube... to match the frequency with the transformer...
I just got a surprise, my friend brought me 6 tube sets 304 material, the inside tube 1,56 cm outside diameter, long 50cm and outside tube have 1,7cm of inside diameter, this give me a gap of about 0,6mm or 0,023inchs thus my capacitance is around 27,5 nf per tube being 6 tubes will become around 166,5nf...
frequency would be around 12khz thus my inductor for the 6 tubes together would be around 1mh...and XL would be 78
Now to allow the damping factor to be low a good deal of resistance must be present in the secondary of the transformer at least i guess
Now i need to solder the tubes to their bases and
Now i would like to get some acrylic tubes to enclosure the cels ( the inside of the inside tube and outside of the outside tube) and another to put all the cells inside...
I think that i will use nylon wire as spacer