According to the info on Dieter's website, the filaments are 5V. A bit of data collection from several tubes will get you information on the current, which I'm guessing is around 100mA and hopefully less.
Since these aren't metal-halide displays, the lower the current, the longer the life of the filament. It might make sense for the frequently-changing digits to keep a moderate standby current flowing on all segments to reduce thermal cycling. And always limit the inrush current by using a series resistor or a current-regulator for each segment. I'm still mulling-over whether I will start yet another project with these tubes, or stick with the long backlog I already have. On Sunday, February 26, 2023 at 11:26:53 AM UTC-8 Nicholas Stock wrote: > They are nice tubes. The price *may* come down a little depending on how > much interest there is and the total number of tubes sold, but that is out > of my control I'm afraid. They don't appear very often on eBay alas. I've > not seen a data sheet for these anywhere and was under the impression they > were never actually sold commercially, just engineering samples... is that > true? Anyone on the list know more about these? > > Cheers, > > Nick > > On Sun, Feb 26, 2023 at 12:06 AM Mark Moulding <[email protected]> wrote: > >> Those are my favorite Numitrons - easy to drive, easy to mount >> attractively, large format - and pretty rare now. That price is still a >> bit steep for a "bulk" purchase; maybe it's about right for a small >> quantity. Do you know how many are available? >> >> Also, has anyone ever seen an official RCA data sheet for that tube? Any >> chance of posting it somewhere? >> >> Here's a clock I made using DTF-104Bs. >> [image: WoodClock_sm.JPG] >> ~~ >> Mark Moulding >> >> >> On Saturday, February 25, 2023 at 12:16:42 PM UTC-8 Nicholas Stock wrote: >> >>> Fellow enthusiasts. I have a vendor (someone I have done business with >>> before) who wants to sell some DTF104B's (NOS) for $25 dollars each. If you >>> wish to buy some, then please contact me directly and I can organize. >>> >>> Best, >>> >>> Nick >>> >> -- >> 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/7d342085-9531-4eba-b368-21e0c5c28112n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/7d342085-9531-4eba-b368-21e0c5c28112n%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/05d5eb22-9bff-4b7d-b028-3bde2d431087n%40googlegroups.com.
