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45PSS · Posted: Sat Mar 19, 2022 8:04 pm Post subject:

Flash bulbs go off with low voltage and will burn your fingers if you are holding one when it goes off.

The problem is likely corroded battery contacts, corroded/tarnished socket, tarnished/corroded switch contacts.

If you have a volt meter you can check the batteries, and socket when the red button is pressed.
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Henry · Posted: Sun Mar 20, 2022 1:27 am Post subject:

There are automotive bulbs with bayonet base that will fit the Graflite socket. If everything is working, you'll see a momentary "flash" of the bulb. Works best in a darkroom!

(Off topic: I've used a 12V automotive bulb as a replacement head lamp in a Lionel locomotive, specifically the 2020 6-8-6 S-2 steam turbine. It has that same bayonet socket, too.)