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Old 9th Jan 2016, 1:12 pm   #1
BigClick
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Default Plasma from a failing rectifier valve

I saw this video on YouTube

http://youtu.be/nuJlxgGdlIc


In the first part of the video the guy drives the tube until it fails. I haven't seen anything like it before.
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Old 9th Jan 2016, 2:58 pm   #2
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Default Re: Plasma from a failing rectifier valve

At what point is the interesting bit?
 
Old 9th Jan 2016, 9:20 pm   #3
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Default Re: Plasma from a failing rectifier valve

Quote:
Originally Posted by merlinmaxwell View Post
At what point is the interesting bit?
1. the violet light show
2. when the green light show appears from the getter plates
3. when the valve plates glow red hot
4. the point just before failure where there is a criss cross pattern in the middle of the valve

The second part where he uses the base for an adapter isnt particualry interesting but the light show in my opinion is.

If you have seen this all before then ok but for me it was pretty impressive
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Old 9th Jan 2016, 9:35 pm   #4
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Default Re: Plasma from a failing rectifier valve

Followed by mains transformer failure?
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Old 9th Jan 2016, 10:05 pm   #5
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Default Re: Plasma from a failing rectifier valve

Quote:
At what point is the interesting bit?
Sorry, I meant when in time on the video.
 
Old 10th Jan 2016, 11:36 am   #6
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Default Re: Plasma from a failing rectifier valve

I have seen a rectifier produce a bright green glow that reflected on the wall behind the set. It was long enough ago that a local shop had a replacement.
I have also seen the purple glow in an output pentode. It slowly went to air over a period of several years.
Perhaps that rectifier was also slowly going to air.
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Old 10th Jan 2016, 12:17 pm   #7
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Default Re: Plasma from a failing rectifier valve

Its quite common to have BLUE glow walking around inside a good hard bottle.
Hard means the vacuum is excellent. Purple glow means the valve is gassy and will sooner or later fail. I read somewhere that a "good hard" valve will have something like one one hundred millionth of air pressure inside. ( was RCA manual)
1/100,000,000
That is even less than deep space!!

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