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It seems a good time to demonstrate neon lighting, during the shorter days.
The making and repairing of real neon signs is a dying trade, regrettably.
The once famous advertising signs at Piccadilly circus in London used to consist largely of real neon, but is now faked by means of large flat panel displays. IMHO, the authorities should have insisted on real neon being retained at such a high profile site.
I used to make socket tester plugs from bog standard plugtops and two neons three resistors. R1 an N1 in series between E and L. R2 and N2 between E and N. R3 between L & N.
Worked reasonably well as a cheapskate quicko tester.