I've never seen a datasheet for these either, but at the end of the first
page on several other RCA datasheets they mention that the DTF-designation
is for developmental numbers. The DR2100 series was previously named
DTF122-125 and the DR2200 series was named DTF137-141.
So the DTF104B might
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
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
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
