Geesh for VFDs?

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Bill Notfaded

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Jun 18, 2021, 1:20:58 PM6/18/21
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https://www.ebay.com/itm/255021357040
https://www.ebay.com/itm/254964421952

Yeah they're a little harder to find but geesh!  I remember when no one really wanted these at all because they're so strange in the layout.  It's not like you can really spell letters very well or anything.  We all know what trying to do alphabet with 7 segments is like.

Bill

Nick Andrews

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Jun 18, 2021, 1:24:55 PM6/18/21
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You're paying for the coolness factor of alien script... !5138008 07734  doesn't look quite right in actual font like on the calculator screen I guess...

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Adrian Godwin

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Jun 18, 2021, 1:51:02 PM6/18/21
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What's this device ? It's more like a CRT than a VFD but is it really a magic eye ?

3 grids (or perhaps 2 grids and a shoot-through anode) seems too complicated for just a lamp.



Michail Wilson

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Jun 18, 2021, 3:30:38 PM6/18/21
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I would never buy them anyway even for a low price simply because of the zero.  Simply difficult to read until you get used to them.  ☹

 

Michail

tntmod54321

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Jun 18, 2021, 4:07:18 PM6/18/21
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It's a single pixel green CRT, meant to be paired with a red and blue tube to make ul a single RGB pixel, meant for giant displays.

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Mac Doktor

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Jun 18, 2021, 4:50:25 PM6/18/21
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It's a deflection-less CRT. They have red, green, or blue phosphors. Three of them formed a color triad that made up each pixel in a stadium sized video display. The seller says "Indicator can adjust size of DOT, depends on modulation and 1st anode voltage". This would be how the brightness was controlled.

Note that the anode voltage is 6kV and the tube requires a special socket. If I weren't so nervous about working around 6kV I'd snag a few. I haven't been watching closely but it seems to me that the current prices are actually a bit lower than when I first saw them years ago and the sockets are more readily available. This my be because of the power supply requirements and/or the fact that three of them wouldn't really do anything interesting.

I'd be interested to know the resolution and dimensions of the display they were used for and how they cooled it. A small monochrome dot matrix display might be within reach of mere mortals who like a challenge. At 30mm in diameter 16 x 16 would be about half a meter square. The filament supply would only be 25.6A at 6.3V RMS. I'm not sure as to what the shipping from Ukraine would be.

A reproduction Jumbotron would be a REALLY interesting project. Anyone?


Terry Bowman, KA4HJH
"The Mac Doctor"

"If only you could see what I've seen with your eyes."—Roy Batty, Blade Runner

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