as for the second person talking about burning up a tube ..   both had the same thing in common close to a solid metal plate.    a  power surge then an arc to the plate then pop.    as a point of safety do no rest your tube miners near metal plates.  use other safer ways to stack them
  it is common sense an open set of ciruits .25 inches away from a metal plate = danger.

look at the tube design .  I told more then one person do not use it on metal. I used wood.  now on this the long tube I rest it on

stone.



it will not have any metal close for it to arc to



runs very cool with second fan