I don't know much about that tube. However, I do know:
1. Filaments have lower resistance when cold.
2. VFD filaments should not get bright enough to see clearly. A tiny
glow in a dark room, maybe.
On 12/6/13 4:06 AM, Gideon Wackers wrote:
I just measured the filament resistance of a IV-11 tube, according to my
multimeter that is roughly 5-5,5 ohm (assuming it measures perfectly at
such a low resistance). But I calculated something different;
I'm going to wire the filaments of two tubes in series and feed them 5
volt though a resistor. So I used the voltage/resistor divider formula.
to calculate the resistor needed for a 2 volt drop (tubes want 2*1,5V)
and that is 10 ohms, going back to the voltage divider that gives ma a
resistance of 15 ohms for both tubes and 7,5 ohms for each filament.
Close you might say but still a 50% difference.
Options:
-my multimeter sucks
-filament resistance differs because it is cold
-both options
-my calculations are wrong
Well while I wait for an answer I'm going to build a little jig with
lego so my tubes will be aligned perfectly straight :)
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David Forbes, Tucson AZ
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