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M Philbrook M Philbrook is offline
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Default NE-51 Neon Bulbs

In article ,
says...

Just acquired a bunch of these lamps. They're in the same mini-bayonet
style as lamps like the #44/47. But would anyone know if these lamps can
be connected directly to 120 volts? Or do they need a resistor, @ if so,
what value?

That lamp is set to operate at 120V AC, so no, you don't need a
resistor. I do think they may be putting one in the base.

A NE-2 however, does need a resistor.