*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 <urro...@att.net> 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 >> >> [image: WoodClock (Small).JPG] >> >> 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 neonixie-l+...@googlegroups.com. >> 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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/297852cb-0da5-4396-9e67-f98fde319dfbn%40googlegroups.com.
