Little tube mystery

[David Chambers]

Hi, some years ago I aquired 7 small Nixie tubes, the markings have gone, but on one there can be seen a faint Hitachi logo. I have attached a pic of one next to a Z5900M for size comparison. I thought they must be CD71 type, but I also have 1 (just one!) tube that is clearly marked CD71 with the Hitachi logo. It is fatter though, and has a very open anode mesh, at 12.5mm dia, whereas the mystery tubes are only 9.4mm dia.

5 of 7  mystery tubes work fine. Of the other 2 0,ne has a broken anode lead, and the other appears to be dead. The leads on them are quite oxidised and are a bit brittle.

I will never do anything with them, so if anybody - prefaraby UK - wants them, let me know.

[Mac Doktor]

On Oct 5, 2021, at 3:24 PM, David Chambers <seafo...@gmail.com> wrote:

I have attached a pic of one next to a Z5900M for size comparison. 

I've converted your .spp file to a jpeg:

Cool tube.

Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

“...the book said something astonishing, a very big thought. The stars, it said, were suns but very far away. The Sun was a star but close up.”—Carl Sagan, "The Backbone Of Night", Cosmos, 1980

[liam bartosiewicz]

This looks more like an LD-955A to me, I’ll get a photo when I get the chance

On Oct 5, 2021, at 12:24 PM, David Chambers <seafo...@gmail.com> wrote:



Hi, some years ago I aquired 7 small Nixie tubes, the markings have gone, but on one there can be seen a faint Hitachi logo. I have attached a pic of one next to a Z5900M for size comparison. I thought they must be CD71 type, but I also have 1 (just one!) tube that is clearly marked CD71 with the Hitachi logo. It is fatter though, and has a very open anode mesh, at 12.5mm dia, whereas the mystery tubes are only 9.4mm dia.

5 of 7  mystery tubes work fine. Of the other 2 0,ne has a broken anode lead, and the other appears to be dead. The leads on them are quite oxidised and are a bit brittle.

I will never do anything with them, so if anybody - prefaraby UK - wants them, let me know.

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<cdnixie.Spp>

[LB]

Here's a shot of a CD71 (left) and an LD-955A (right):

The LD-955A is noticeably slimmer, but it's kinda hard to make it out in this pic. 

And here are the markings:

[Dieter Waechter]

Hi!

LD-955A is the same as CD89P (100% match). High brightness. Designed for
multiplexing, M7S-1 base (12 long wires) - both by NEC. Only these two
in this substitute group - no other matches.

CD71 is part of a larger substitute group (group #0030 for my notes
here) - this is:

CD71
CD71LA
CD78
CD78/GR-115
CD78s
CD79
GR-115
ZM1325

But none of these all are "mystery" tubes - all well known. ;)

Best regards
Dieter

Am 07.10.2021 um 08:33 schrieb LB:
> Here's a shot of a CD71 (left) and an LD-955A (right):
> The LD-955A is noticeably slimmer, but it's kinda hard to make it out in
> this pic.

> IMG_7028.jpg
> And here are the markings:

>> <https://groups.google.com/d/msgid/neonixie-l/f89b71be-16e8-4eb2-bc88-bd258c1b60bbn%40googlegroups.com?utm_medium=email&utm_source=footer>.
>> <cdnixie.Spp>

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