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Old 16th September 2013, 12:35 PM   #1
M Gregg is offline M Gregg  United Kingdom
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Default Tubes and the sun?

I assume it makes no difference,

However I will ask the question,

Does exposing tubes to the sun for long periods have any effect.
ie storing them open (not in boxes) by a window?


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Old 16th September 2013, 12:57 PM   #2
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Old 16th September 2013, 01:14 PM   #3
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I very much doubt it makes any difference in a vacuum.
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Old 16th September 2013, 01:14 PM   #4
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So far as I know, it won't cause any problems whatsoever.
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Old 16th September 2013, 01:17 PM   #5
DF96 is offline DF96  England
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I read somewhere that some valves might have some photoemission alongside thermionic emission, thus adding noise. I have no idea if this is true, but I suspect that at most it will be a very small effect.
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Old 16th September 2013, 06:55 PM   #6
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Certain electrometer tubes like the Raytheon 5886 are very light sensitive and must be operated and tested in darkness. I assume because of their extremely high input impedance. Every instance of use I've seen by such manufactures as Keithley, General Radio and Victoreen shields them from any external light. Photomultipliers are also shielded from light other then the operating window.
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Old 16th September 2013, 07:02 PM   #7
wg_ski is offline wg_ski  United States
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The UV might deteriorate the base, possibly causing it to crack and break off more easily. Unless it's ceramic.

I'd be more worried about the cat knocking them off the window sill, however.
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Old 16th September 2013, 07:19 PM   #8
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Quote:
Originally Posted by DF96 View Post
I read somewhere that some valves might have some photoemission alongside thermionic emission, thus adding noise. I have no idea if this is true, but I suspect that at most it will be a very small effect.
Langford Smith's book has a chapter in which he describes that some part of the grid currents are because of light from cathode itself.
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Old 16th September 2013, 10:18 PM   #9
Merlinb is offline Merlinb  United Kingdom
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Seems unlikely. The metals used in valves have too high a work function to permit photoemission from the light that penetrates the glass (photoemission tends to be dominated by soft X-rays from the anode).
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Old 16th September 2013, 10:23 PM   #10
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wont make them sound better either
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