The quinn of numitrons IV-13... detronized!

[Bartek Ogryz]

Hi everyone!

I would like to proudly share my latest catch: Apollo DA2500 numitron tube. It's the biggest numitron I know, the digit is 25mm high - 5mm more, than IV-13.

It's fully operational, but unfortunatelly my camera is unable to make a nice looking photo of the segments glowing. Last photo is a comparison to IV-13.

Bartek.

[Adrian Godwin]

I'm no photographer, but I have the same or similar  problem trying to take photos of LED installations. I get a dim background and overexposed leds, consequently no colours. I think the problem is that the autoexposure adjusts for the average level, which is correct for neither on a high-contrast scene. Our eyes can cope with this by correctly exposing the segments and making the unlit parts invisible - which may not be what you want when illustrating, but works well for reading the values whilst obscuring the structure.

The answer is possibly to run them at low brightness and with plenty of incident light, so there is not so much difference in brightness between self-lit and incidently-lit parts. 

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[Richard Scales]

Those are some nice looking Numitrons.

If you find that you have way more of them than you can cope with - I would love to help! I am on a bit of a numitron mission right now.

- Richard