ILVM1-1/7 Type I VFD tubes

[Manuel Azevedo]

Hi guys,

After this order on eBay:

http://www.ebay.ie/itm/IVLM1-1-7-IV-25-Russian-VFD-Matrix-Tubes-Nixie-New-Lot-of-100-Pcs/332088405862?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649

I was surprised to discover that there's a different type of IVLM1-1/7. In this type, there are two pins that light two pixels at the same time. This seller description only became obvious after I saw the data sheet:

Shown are 7 points that can be driven alternately as a single point and pair (light sequence is 1 - 2 - 1 - 2 - 1 point).

Here's an ILVM1-1/7 data sheet:



Notice that each pixel has it's own pin.

Here's the Type I model data sheet:


I wonder what can I do with this tube that shows two pixels at the same time on two pins.

As a replacement for the IV-25 or IVLM1-1/7, I don't think it might work.

Any clues?

Thanks,

Manuel

[Roddy Scott]

You could mount 7 together behind a smoked acrylic sheet and have a random image generator driven display module.

Just a thought.

[Konstantin]

Hi,

Is far as I remember, combined segments are used to simplify circuit to make seven segment style digits on the clock  matrix look like display.

I know that   IV-26 ( just bigger than IV-25)  has 3  modification types:  type 1( all dots are separated) type2 and type3.

Type 2 and type3 have combined segments depends on their vertical or horizontal layout position  in the clock.

They have been used in “Электроника 7” clocks, which were very popular in offices and factories in Soviet  time.

I think IVLM1-1/7 Type1 were designed in similar manner to make dot matrix clock like    in “Электроника 7”, but smaller…

 

 

All the best, Konstantin

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[Manuel Azevedo]

Thank you, Konstantin and everybody else,

 

I will see what I can do with them.

 

Regards,

 

Manuel

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[Terry Kennedy]

On Thursday, June 29, 2017 at 2:43:03 PM UTC-4, kosbo.com wrote:

Is far as I remember, combined segments are used to simplify circuit to make seven segment style digits on the clock  matrix look like display.

I know that   IV-26 ( just bigger than IV-25)  has 3  modification types:  type 1( all dots are separated) type2 and type3.

Type 2 and type3 have combined segments depends on their vertical or horizontal layout position  in the clock.

They have been used in “Электроника 7” clocks, which were very popular in offices and factories in Soviet  time.

I think IVLM1-1/7 Type1 were designed in similar manner to make dot matrix clock like    in “Электроника 7”, but smaller.

I have blogged about the Elektronika 7 a few times. Those entries go into a fair amount of detail about the clocks and the dot matrix tubes in them: https://www.glaver.org/blog/?s=elektronika+clock

I don't know about the IV-25, but the IV-26 tubes start dimming pretty rapidly after being on for some time. When first installed, the phosphor dots are brighter under the filament. Within a day or two this changes to an even illumination. After some thousands of hours, the dots start to be dimmer under the filament, until they are almost not lit at all.

New tubes in left 2 digits, older tubes on right:

[Manuel Azevedo]

Thank you Terry, I know understand why this odd tube behaviour.

Excellent articles btw!

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