Here are some hook-up ideas:
<https://lh3.googleusercontent.com/-TYgUL6lC9xs/UYHh1ChpH9I/AAAAAAAAKkY/Q_gBSMefhmk/s1600/Magic_Eye01.gif>
Magic eyes are pretty simple to play with, once you get use to them. As
with all "small signal" triodes (the front end of this tube), a voltage
negative to its cathode needs to be applied. How negative, determines how
wide the pie slice opens. This does not mean that you need a negative
supply. A common trick used in the tube era, was a concept called "cathode
bias". Current is always flowing thru the tube, from anode (plate [2] and
target [4]) to cathode [5]. if you stick a resistor between the cathode,
and ground, that current will drop a voltage across that resistor. In the
circuit, I chose a 3.3K resistor. If 3mA is flowing thru the tube, then
almost 10V will drop across the resistor. So if the grid [3] is at ground,
it will be 10V below, or more negative than the cathode, sitting roughly at
+10V. With a 200V supply, you'll need to change the grid voltage ~6.5V, to
fully open or close, the "shadow", or pie slice.
If you wish to continue playing with tubes, you'll need this site:
http://www.tubedata.org/
All those flags at the bottom are identical "mirror" sites, located all
over the world, hence the flags. Click on the American flag, if you're in
the US, and it will route you here:
http://tubedata.milbert.com/index.html
Here's Sylvania's datasheet for your tube:
http://tubedata.milbert.com/sheets/084/6/6E5.pdf
And here's a site dedicated to nothing but eye tubes:
http://www.magiceyetubes.com/
Also, there's some goober that made some winker toys, using these tubes:
http://threeneurons.wordpress.com/magic-eye-stuff/
Oh, yeah, that's me ... oops.
On Wednesday, May 1, 2013 6:56:29 PM UTC-7, William Lee wrote:
>
> I was recently lucky enough to receive a few Sylvania 6E5 magic eye
> tubes as part of an assortment of nixies and decatrons.
>
> I know these were typically used in radio tuner applications from what
> I understand, and I've looked over the datasheet and a few other
> resources, but my experience with vacuum tubes and CRTs is very
> limited.
>
> I was just wondering if anyone on the list had experience with these
> and if possible, could recommend the simplest circuit possible to test
> one of these.
>
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