Hi Peter,
I had a look at my junk bin, and I have 20+ used (untested) DIP numitrons. There are 2 different sizes, one type is marked KW-615-17, the other KW-515. There are also some marked fdg-5v18. If you are interested, I’ll charge $20 for my time packing it all up, plus my cost for mailing. The numitrons are free. Let me know if you are interested, and PM me if you want to discuss. Cheers, Bill From: [email protected] [mailto:[email protected]] On Behalf Of peter bunge Sent: Thursday, October 28, 2021 4:27 PM To: [email protected] Subject: Re: [neonixie-l] Re: Looking for some info about RCA DTF numitrons Would anyone care to sell me an end view Numitron (DTF104B) to add to my vintage digital working display? I would also like a DIP 7 segment incandescent display, or anything interesting not in the picture. Nothing too new. The LED Bargraph and Magic Eye react to ambient sound. On Thu, Oct 28, 2021 at 1:41 PM Mark Moulding <[email protected] <mailto:[email protected]> > wrote: Er, you're not the only one with a stash of these.... :) I'm glad to hear that - it means that there will be other projects showing up with them. One of the reasons I like Numitrons so much, besides being incredibly easy to drive, is their longevity. At rated voltage (which I don't actually know for these tubes, but expect to be around 4.5V), they have a rated life of 100,000 hours, and that goes up rapidly to infinity at slightly lower voltages. There's also no cathode poisoning or other issues to worry about. This all means that I'm comfortable building something with the last of an unobtanium part, knowing that it won't need replacement in my lifetime. ~~ Mark Moulding On Wednesday, October 27, 2021 at 11:02:53 AM UTC-7 Pramanicin wrote: Er, you're not the only one with a stash of these.... :) They are nice looking tubes... On Wed, Oct 27, 2021 at 10:50 AM Mark Moulding <[email protected] <mailto:[email protected]> > wrote: I have a pretty good sized collection of RCA DTF-104B Numitrons, which I think are especially attractive - they're large digits, in a flat-topped end-view tube. They're quite rare now, and in fact I think I have most of the remaining world stock of these things (around 150 or so). Although I've successfully used them in a couple of projects, I've never been able to locate a data sheet for them - does anyone have any pointers for this specific tube? Thanks! ~~ Mark Moulding <https://groups.google.com/group/neonixie-l/attach/50dcbc1ae9fe9/WoodClock%20(Small).JPG?part=0.1&view=1> On Tuesday, October 26, 2021 at 2:21:21 PM UTC-7 Dekatron42 wrote: I knew I'd seen the number, and found them just now: http://www.tube-tester.com/sites/nixie/dat_arch/Numitron_RCA_01.pdf at the bottom of the page, they are development numbers for the DR2200 series. /Martin On Tuesday, 26 October 2021 at 22:21:47 UTC+2 Dekatron42 wrote: Tubes designated DTF are development numbers used by Apollo/RCA - it says so at the bottom of their datasheets. /Martin On Tuesday, 26 October 2021 at 21:43:52 UTC+2 Bartek Ogryz wrote: Hi! They appeared on eBay last days: DTF137, DTF138, DTF140 (or maybe DTF/37, DTF/38, DTF/40). What are theese? Anyone has some more knowledge about them? Bartek. BTW: If someone is interested in numitrons, quite rare Apollo DA-2500 are hiding on eBay: item no 254866404573. Unfortunatelly, as the seller told me, all that have left, are without markings... -- 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] <mailto:[email protected]> . To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/1baae699-e553-4f02-95f7-9b6b07cbee90n%40googlegroups.com <https://groups.google.com/d/msgid/neonixie-l/1baae699-e553-4f02-95f7-9b6b07cbee90n%40googlegroups.com?utm_medium=email&utm_source=footer> . -- 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] <mailto:[email protected]> . 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