For HV "glitch" resistor, avoid wirewound construction, both in the
sand packages or in the big tubular ceramics, for 5 kV 1 Amp and
higher supplies. Carborundum is the best way to go, if you can get
them from Kanthal Globar or whoever they are called now. You can find
them surplus sometimes, check around Fair radio and others.
Inductive wirewounds are basically an air solenoid, and if you force
a lot of current through it, the winding will collapse due to EMF.
Also, they sometime will just track over the length in a burst of
flame with too much HV.
If you can use a string of resistors might get by with carbon types.
John
K5PRO
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