Wanted: Y-4075 datasheet

[marta_kson]

I have a few unmarked VFD tubes that I belive is the General Electric
Y-4075, but know nothing about them. They looks exactly as the tube
pictured at:
<http://www.decadecounter.com/vta/articleview.php?item=961>
That's the only information I has found about them.

Have tried to apply filament voltage until just below where it glows
and they works nicely, but I would appreciate a data sheet giving the
correct filament voltage.

[John Rehwinkel]

I figured Radio Shack used to provide data sheets for many of their parts, so
I tried doing a search on 276-050. Unfortunately, Radio Shack has re-used that
part number TWICE now. Once for a red LED, and again for a solderless breadboard.

I'd suggest emailing the good folks at decadecounter.com and asking them if they'd
scan the other side of the card it came on. There's probably at least minimal data
there.

Then again, Google is your friend:

Data sheet here:

http://4sale.sbszoo.com/tubes/Y-4075.pdf

Short version: filament 1.2V, segments 27V. Note that the data sheet states
4mA nominal and 9mA max for the filament, but on the example schematic,
the filament is called out at 1.5V at 43mA. I suspect the schematic was lifted
from the data sheet for a different (probably larger) tube.

- John

[marta_kson]

> I'd suggest emailing the good folks at decadecounter.com and asking them...

They have this statement on their site:
4. We are not a datasheet archive. If it's not on the site, it's not
available.

Thanks for finding at least some data, it's better than nothing.

> Note that the data sheet states 4mA nominal and 9mA max for the filament,
> but on the example schematic, the filament is called out at 1.5V at 43mA.

I see no such large discrepancies there. The data sheet states 40mA at
1.2V for the filament. The 4mA is for cathode current and not the
current that keeps it hot.

Nevertheless, the inferior design (resembling something a happy
beginner comes up with by empirical means) in the schematic and the
bad notation with capital M for milli does add up to a feeling of lack
of confidence. Are they stating nominal voltage 1.2V for the filament,
or is it a worst case for measuring luminosity? Is the nominal voltage
maybe 1.5V?