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Old 16th September 2013, 10:52 PM   #11
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Tubes work better in the dark. You can see they glow brighter.

Cheers

Ian
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Old 17th September 2013, 12:27 PM   #12
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I don't really know if they work better, but it is pleasant to me to see the heaters hot at night.
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Old 18th September 2013, 06:43 PM   #13
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If the sun is the cathode, is the earth the plate?... and the atmosphere the grid? We could make a huge single-ended amplifier!
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Old 18th September 2013, 07:10 PM   #14
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by kstagger View Post
If the sun is the cathode, is the earth the plate?... and the atmosphere the grid? We could make a huge single-ended amplifier!
I like it.

Only problem is we have power flow with no circuit return path
Also the smog electron cloud could be a major problem.

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Old 18th September 2013, 07:25 PM   #15
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If the sun is the cathode, is the earth the plate?... and the atmosphere the grid? We could make a huge single-ended amplifier!
And Mars, the screen?
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Old 19th September 2013, 10:03 AM   #16
12E1 is offline 12E1  United Kingdom
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And Mars, the screen?
No - that would have to be Venus (Mars is further away from us and the sun). Mercury would be the control grid.

The basic problem with this strange concept is be that the elements would only be in alignment very rarely due to their different solar orbit durations. To explore, see here... Solar System Scope
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Old 19th September 2013, 12:18 PM   #17
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And a multigrid tube?
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Old 19th September 2013, 09:46 PM   #18
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but we're going to need a gigantic output transformer - unless we direct couple.
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Old 19th September 2013, 10:56 PM   #19
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Cathodes eventually lose the ability to emit enough electrons (or so I've read). Sun might be able to cause some cathode emission, but I have no idea if the amount is significant.
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Old 21st September 2013, 07:29 PM   #20
M Gregg is offline M Gregg  United Kingdom
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Cathodes eventually lose the ability to emit enough electrons (or so I've read).
Sounds just like the sun. I think its when it starts making iron.
Then lights out and Boom.

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