I found this at radiomuseum.org:
<quote>
At this point, I should clarify the difference between the IN-9 and the
IN-13
The IN-13 takes up to 5mA for a 12cm orange glow from Neon gas, and has
three electrodes. One perforated cylinder as the anode, a central wire
cathode for the glow, and a short pilot cathode to start the glow.
Most IN-9 take up to 10mA for a 10cm purple glow from Argon gas, and
only have two electrodes.
But some IN-9, like the one used in this thread, are filled with Neon
gas and glow orange, but the current rating and size are still same.
Confusion between the two glow colors caused me to make a mistake I made
in this thread: The tube you see in this thread is a*2 pin IN-9*, not a
3 pin IN-13.
In terms of application of the tube, the two glow tubes the significant
differences are the maximum current and the extra pilot cathode for the
IN-13. The strike voltage around 120V and sustain voltage around 100V
are similar among all three tubes.
The IN-13 has twice the sensitivity of the IN-9, so this should be taken
into account when applying the tube. If the glow swing is too extreme,
some resistance in series with the tube can be added.
The pilot cathode of the IN-13 requires a small current to insure that
the main cathode starts properly. This negative bias could be obtained
with a 100-500kOhm resistor to the grid circuit of the local oscillator.
The grid of the local oscillator, usually develops around -10V, which is
enough to supply up to 100uA into the pilot cathode of the IN-13.
The extra -10V of bias at the pilot cathode of the IN-13, eliminates the
need for the startup circuit with a diode and resistor, which I included
in the circuit above for the IN-9. This was necessary because the low B+
of an AC/DC 117VAC radio may not guaranty the starting voltage for the
two terminal IN-9.
Best regards,
-Joe
</quote>
-Adam
On 11/28/2012 1:08 PM, Michel wrote:
Just out of interest, is the IN-9 brighter than the IN-13? IN-9
requires 10mA current for full bar and IN-13 4mA. Wondering where the
extra 6mA goes to, heat or light?
Michel
On Tuesday, November 27, 2012 5:41:16 AM UTC+11, Dan Foster wrote:
Hello,
I have a few (10) IN-9 Bargraph tubes that I no longer want,
thought I'd ask here before I list them on eBay. Anyone interested?
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