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Old 22nd March 2004, 01:37 PM   #1
morfeas is offline morfeas  Greece
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Default Gassy Tube

This is how it looks when you let some air in.

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Old 22nd March 2004, 01:41 PM   #2
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WOW!

What kind of tube? That's spectacular!
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Old 22nd March 2004, 01:59 PM   #3
morfeas is offline morfeas  Greece
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ECC81

Can't imagine how it would look with a big one.
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Old 22nd March 2004, 02:56 PM   #4
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It looks beauutiful!!! How did you get the air out increcementally?

Was there a hairline crack to begin with eh?


If only they sold em like this and they operated in normal parameters
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Old 22nd March 2004, 03:03 PM   #5
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HI,

Just like the emission color for a mercury vapour rectifier (RCA 83)

Red
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Old 22nd March 2004, 06:18 PM   #6
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Hehe, I've had a gassy 12AT7. A special thing about this type on my tube tester is I can arrange the voltages so I get electron emission through the holes in the plates and get some blue spots on the glass.. well this thing not only had blue spots but purple trails showing every electron moving!

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Old 22nd March 2004, 08:39 PM   #7
morfeas is offline morfeas  Greece
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I did bend the pins just a little to get better contact in a loose socket. I think with heating up the pin-glass seal broke letting just a zip of air inside. No cracks on the glass.

Still have the tube around and the getter looks fine.

Have done this (bending the pins) many times with other brands and had no problem.

The most spectacular was the arcs inside. Amazing view.
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Old 22nd March 2004, 11:50 PM   #8
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If there was any crack whatsoever it would continue to leak. And tubes tend not to be self-healing when it comes to vacuum, so that's odd..

Tim
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Old 22nd March 2004, 11:53 PM   #9
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Hi,

Quote:
This is how it looks when you let some air in.
That's not air but a polluted cathode surface that somehow releases it's ions all of a sudden.

If it were a leak it would have killed the tube within a split second.

Either way it's quite unique...

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Old 23rd March 2004, 04:32 AM   #10
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Looks like something out of Star Trek or inside a star

That blue glow gets me thinkin...

Stop me Frank!!! :P

Has anyone seen a supply of Blue Neon 'power-switch' indicator lamps? or a 'tuning-indicator' Blue version?

I'm sure if there were they'd sell like hot-cakes, maybe someone with influence can whisper in Svetlana/Sylvania's ear about making a few volume level indicators with blue glow?
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