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jfyi….for some reason coil HV secondary windings seem to be increasing in the higher ohm range these days. Amazon stuff anyway.
Most of my recent ones were around 8kohms + whereas older one were lower in the 4-7 kohms range.
Can’t say they don’t work but I always preferred the lower range ones because I have this suspicion the new ones have smaller gauge wire causing resistance to increase but worse…. such fine wire is surely more delicate and could lead to insulation failure on the varnish. Time will tell I guess.
Smaller wire on the secondary allows cost cutting especially if they kept the same amount of turns. Magnetism is a strange thing … current #of turns.. ratios etc…
Unfortunately the only way to know would be a lobotomy/autopsy or accurate electrical testing HV voltage outputs to compare low and high end secondaries performance
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