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I got a screenshot of the schematic for my Zenith 23" TV showing where the Neon glowbulb is in the circuit, and from what I can see, it seems to be in the Vertical Deflection Circuit, but what purpose it's serving there I'm not sure, but I do know its not serving the purpose of spark-gap service because there's a couple of wires on the picture tube socket serving that purpose, as can be seen on the schematic.
See the schematic excerpt below.
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