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Depending on the type, neon globes will strike anywhere between 60 -100V. The little neon globes are probably of the type NE-2. The tube strikes when the voltage reaches about 65VAC and is extinguished when the voltage drops below 52VAC. For a 240VAC source, just use a 330Kohm resistor in series which will limit the current to about 0.5mA which is sufficient to keep it glowing. Or use a 270Kohm resistor for slightly more current 0.6mA (glows brighter).
Robert
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