To solve the glow starting from the center or top of the tube, i never turn the
tube fully off. I will turn it on full then ramp the current down until a small
segment is still lit. This helped make them much more reliable.
-joe
On Tuesday, October 8, 2019, gregebert wrote:
> I did limited
A 5 Volts power supply is a big limitation regarding to a current source
compliance. I'd do the following:
1 - Decouple the outputs of the filters from the rectifiers, so as to have
an output voltage referenced to 0 and up to 5 volt. The rectifiers act as
peak detectors and your signal moves
I did limited experimenting with these tubes. What I found is that a
current-controlled supply is the only way to get repeatable behavior out of
those tubes.
If I just used a traditional variable-DC supply with a series resistor, I
had erratic behavior such as glowing from the opposite end or
I have few spare. Two with broken lead unfortunately :( I am working on
repairing them. Angway I do not have any IN-13 right now, but probably will get
some if succeed with this project.
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My advice... Switch to IN-13's unless you have a case of IN-9's.
Bill
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Give them 6 to 12 hours. This is what I have learned over time. In-13s are
more reliable at this than in-9s. On my kits I fing I get a 25% loss.
-joe
On Sun, Nov 25, 2018, 11:23 AM Jon
> Are you sure your current regulator circuit is capable of being set to
> sink >10mA? You should be able to
Are you sure your current regulator circuit is capable of being set to sink
>10mA? You should be able to test it at a lower voltage without the IN9 in
place to experimentally verify that.
Jon.
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Forget to mention, that voltage od tubes stays around 100V all over the
time. In one point, when i am turning reference potentiometer tubes are
switching off and starting to glow from around middle of bar with random
length.
W dniu poniedziałek, 12 listopada 2018 17:49:50 UTC+1 użytkownik
Hi again guys.
>
As I finally found time to continue with my IN-9 project I did small checks
according to your suggestions.
I connected 2 separate tubes from 2 separate current mirrors connected to
my HV PSU, and both of them light up same amount like before.
Current draw through HV PSU get
Nice pictures Mike!
I'd agree with what you're representing here (esp the non-linearity at the
top end), with one additional comment - this won't necessarily apply to
tubes that have been sat unused in storage for a few decades. Some
IN-9 seem to suffer from a sleeping sickness / cathode
Full "deflection" happens with 12mA, and the tube gets a little non-linear
past 8mA. Monitor the current thru the tube, and the voltage across the
tube, at the same time. Make sure your supply is up to the task before
finding fault in the tube.
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