I did a quick search and these these things are for sale on Etsy and various other merchant sites I've never heard of. Similar pricing but eBay does give you something resembling a safety net.
White plastic with red lenses seems to be the norm. > On Apr 17, 2021, at 5:49 AM, Dekatron42 <[email protected]> wrote: > > I had one of these many years ago and if I remember correctly now it is a > resistor of some 100k, or perhaps it was closer to 1Meg, as it just limits > the current flowing in the trigger circuit. You can google these and find > circuits like the ones below: I finally dug a meter out and checked the component marked "M22". Sure enough it's a .22MΩ (220kΩ) resistor. It's connected directly to the touch-sensitive "key" on the front. > On Apr 17, 2021, at 3:21 PM, Yohan Park <[email protected]> wrote: > > Ah yes I've found them. They're less suitable to use as an indicator. The tubes in the ones I purchased are identical. There's no part number and the only marking is "OTK 25". Apparently that means that quality control inspector number 25 has approved the lamp as military spec. Feel free to correct me if I'm wrong. I still can't figure out what they were used for. Functionally they're just a box with five momentary sort-of isolated touch switches controlling a 220V RMS mains load. Cheaper than using mechanical switches? Terry Bowman, KA4HJH "The Mac Doctor" https://www.astarcloseup.com/ “...the book said something astonishing, a very big thought. The stars, it said, were suns but very far away. The Sun was a star but close up.”—Carl Sagan, "The Backbone Of Night", Cosmos, 1980 -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/7984C3FF-E18C-41F2-B434-AE0F6A691BB0%40gmail.com.
