Quote:
Originally Posted by NewVista
Like Bob says, won't get true test of (purple) gas indication until all voltages present or a tesla coil is employed.
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The blue glow is from the gas being ionized. If you have emission you've got electrons moving and the couple of hundred volts used when testing a CRT accelerates them well above the few eV ionization potential of the gas.
If there were no emission, then yes the only true test would be the Tesla coil.