I'd say that they are pre-production or engineering samples, tubes that are produced either for in house development or samples sent to presumptive buyers/customers who are interested in designing with them to release products as they become available in production volumes.
/Martin On Wednesday, 27 October 2021 at 22:29:18 UTC+2 Bartek Ogryz wrote: > Thank you Martin! > What does it mean in practice? Are those just an old names of the same > tubes, nowadays named DR22xx? > Sorry for banal question. I understand the words, but not the whole phrase. > > Mark, those are beautifull, I won't be able to sleep now ;) > > Bartek. > > środa, 27 października 2021 o 20:02:53 UTC+2 Pramanicin napisał(a): > >> 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]> 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 [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]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/1a2abe6e-9937-4b83-85c1-1e44912f8afbn%40googlegroups.com.
