EEV E727G - what's that?

[Marcin Adamski]

Hi Guys,

have you seen this EEV E727G contraption on ebay
https://www.ebay.com/itm/115697380857 ?
I have never even heard about it, nor can find any info about it.

Marcin

[Olivier]

I found this old page
It shows the same pictures as the ad! Strange.

Olivier

[Dekatron42]

It says in the auction text that "The picture with power-on display is from the WEB 'used equipment for a display of the same type'".

There are some bar-codes as well as other text in the last photo which might help with finding information. The first portions of the NSN number 10ZZ356 can be found to be aviation parts, but the only part I found there was an unnamed item with 10ZZ356111, so the hunt is on.

/Martin

[Dieter Waechter]

This series is rare!
Datasheet snapshot attached.
Dieter

Am 07.02.2023 um 16:49 schrieb Dekatron42:
> It says in the auction text that "The picture with power-on display is
> from the WEB 'used equipment for a display of the same type'".
>
> There are some bar-codes as well as other text in the last photo which
> might help with finding information. The first portions of the NSN
> number 10ZZ356 can be found to be aviation parts, but the only part I
> found there was an unnamed item with 10ZZ356111, so the hunt is on.
>
> /Martin
>

> Picture 10 of 10
>
> On Tuesday, 7 February 2023 at 16:27:18 UTC+1 lest...@gmail.com wrote:
>

> I found this old page <https://riffuchs.livejournal.com/153725.html>

> It shows the same pictures as the ad! Strange.
>
> Olivier
>
> On Tuesday, 7 February 2023 at 6:36:26 pm UTC+8 marcin wrote:
>
> Hi Guys,
>
> have you seen this EEV E727G contraption on ebay
> https://www.ebay.com/itm/115697380857 ?
> I have never even heard about it, nor can find any info about it.
>
> Marcin
>

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[gregebert]

The NSN is a clue, and the 1995 date-code suggests this was a spare-part that got inventoried around that time. My guess is this was for some sort of military equipment that was deployed in the 1970s/1980s, and scrapped after the 1990s, which led to this device being sold-off as surplus.

Given the size and weight, I guess this was for some kind of stationary display at a ground installation.

Doomsday clock at a nuke-missile silo ?

Just when you think you saw every possible display device, something even more weird comes along.

I thought NIMO tubes were the most bizarre, then I saw the BinaView on Fran Blanche's site.

THIS one takes the prize, for now.

[Nicholas Stock]

The BinaViews were amazingly complicated for what we consider these days to be such a rudimentary task.... fascinating to see how they operate. I wonder if you could recreate that easily....

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[gregebert]

I've pondered over it as a 3D-printing project. I have a lot of doubts about it being something durable. Moving mechanical parts are the bane of technology because they wear-out and require maintenance.

Imagine what a binaview clock would sound like at midnite........

[Dekatron42]

The three barcodes says just what is printed in clear text under/after them:

10ZZ 356346
01
01

I scanned them with a Gryphon GM4100 wireless scanner.

/Martin

[Dekatron42]

Any chance you can publish the rest of that data book where that sheet came from Dieter?

I've been looking for one for ages!

/Martin

[Olivier]

here is a short datasheet. Power supply 12V (integrated) and segments lit with 5V.

Thanks,

Olivier 

[liam bartosiewicz]

I’ve actually attempted to make a very simplistic version of a binaview, the principle is not particularly complicated, just hard to execute with good readability. I may try to pick up the project again in the future.

On Feb 7, 2023, at 12:57 PM, gregebert <greg...@hotmail.com> wrote:

I've pondered over it as a 3D-printing project. I have a lot of doubts about it being something durable. Moving mechanical parts are the bane of technology because they wear-out and require maintenance.

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[Mike Mitchell]

Here's a collection of images for an LCD display that simulate various physical displays.  Bina-view is one of them.

https://savageelectronics.com/display-array-clock-faces-update/

[Marcin Adamski]

Technically this device could be quite trivial. Simpler, and less demanding tolerance than Nimo. Just one flood gun with grids controlling the segments (as reported by riffuchs from https://riffuchs.livejournal.com/153725.html), plus some internal stencil-style screening between the 'segments'. Still VFD does the same only so much easier. So, why? Longer lifespan? Brighter? Fulfilling insane-price requirement for a military order?

Pity the price, I love absurd technology. Anyway, seems that such device was sold on ebay de in 2014 for 'pennies' (radiokot.ru), but I can barely understand what they were actually talking about there, even with google translate. I wonder if it was the tube(s) from riffuchs - riffuchs seems to be from Germany.

Marcin

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[gregebert]

I'm guessing that CRT-style manufacturing, where phosphor is deposited on the tube-face, was well-established technology in the 1960's due to massive production of TV's. On the other hand, VFDs were emerging technology because the much smaller size required tighter manufacturing tolerances, and depositing phosphor onto a conducting anode was still being perfected. Yes, this was done for magic-eye tubes, but they had a very short lifespan, maybe a few hundred hours. I'm sure the chemical composition of VFD phosphors was also under development; they are much brighter than magic eyes and operate at a lower voltage.

[Adrian Godwin]

These things are similar tech but for pixels rather than 7-segment : https://www.youtube.com/watch?v=AclwH64eAkU

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[Marcin Adamski]

Yeap, indeed. There was a few of those: The Futaba Jumbotron you have mentioned, Itron 2F89068, Nimo (of course) and Telefunken XM1000, or the soviet ILD3s or the thyrathron-style displays. The ITS1A is actually a very similar concept.

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[Loet Koenig]

I found 5 of these E727G from the English Electric Valve Co. on a junk yard about 25 years ago. I guess they were used in a scale. Took some tinkering but in the end I build a DFC77-controlled clock using four of them. A MSP430 is used to control them, using 4 of its 8bit DIOs. 

They have a really lovely glow and a nice sequence when they first start up :-)

Best Regards

Michael