For what my limited knowledge of Rubenoid tubes is worth:
Most of those tubes use a wide range audio source, where any flame effect will be limited below the 500 Hz. 6 inch drivers would be good, please try to clip the frequencies above, the remaining audible sound is not much good anyway.
For the tables I have seen one in the video behaves very good. Though continuous ignition may be a thought. As well as -some- heat transport from the center of the grid out (where?). No cooling down of the center will give an overheated grid ever.
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