In Reply to: RE: OT: Thorsten, 2A3s, 45s and 300Bs. posted by Tre' on July 16, 2012 at 08:19:50:
When a filament is heated electrons come free from the filament coating and form a huge electron cloud known as a space charge. When B+ is applied to the plate some electrons leave the space charge and migrate to the plate creating a current path.There are so many electrons in this cloud that the plate will never deplete them and they're being replenished from the filament continually.
These electrons move reasonably quickly across the vacuum, about 1/3 the speed of light, but they move very slowly in metal, etc (the filament winding, the cathode resistor, the plate, the tube pin, etc.) about 0.0093 cm/s for 1 amp depending on wire size.
We do not listen to these electrons that have created this current path but instead the current that uses this path.
The current that uses the path, created by the electrons, moves at (almost) the speed of light.
So the differences in the path lengths, that you seem so concerned about, are meaningless.
Tre'
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"Still Working the Problem"
Edits: 07/17/12
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Follow Ups
- Electrons do not go directly from the filament to the plate - Tre' 08:44:29 07/17/12 (24)
- Electrons? - gusser 10:12:16 07/18/12 (22)
- a bit of morning sarcasm - Tre' 11:26:37 07/18/12 (0)
- RE: Electrons? - drlowmu 10:45:14 07/18/12 (20)
- Right. Now explain that to your buddy Dennis!(nt) - gusser 11:06:29 07/18/12 (19)
- RE: Right. Now explain that to your buddy Dennis!(nt) - Tre' 11:54:18 07/18/12 (18)
- RE: Right. Now explain that to your buddy Dennis!(nt) - tube wrangler 07:50:42 07/19/12 (17)
- RE: Right. Now explain that to your buddy Dennis!(nt) - Tre' 09:30:06 07/19/12 (16)
- RE: Right. Now explain that to your buddy Dennis!(nt) - tube wrangler 15:04:41 07/19/12 (15)
- RE: Right. Now explain that to your buddy Dennis!(nt) - gusser 15:39:08 07/19/12 (14)
- RE: Right. Now explain that to your buddy Dennis!(nt) - tube wrangler 19:13:23 07/19/12 (13)
- RE: Right. Now explain that to your buddy Dennis!(nt) - mach1 23:52:20 07/19/12 (12)
- RE: Right. Now explain that to your buddy Dennis!(nt) - tube wrangler 09:40:28 07/20/12 (11)
- RE: Right. Now explain that to your buddy Dennis!(nt) - gusser 10:01:37 07/20/12 (10)
- RE: Right. Now explain that to your buddy Dennis!(nt) - tube wrangler 12:33:01 07/20/12 (1)
- RE: Right. Now explain that to your buddy Dennis!(nt) - Tre' 18:26:45 07/20/12 (0)
- RE: Right. Now explain that to your buddy Dennis!(nt) - drlowmu 11:40:14 07/20/12 (6)
- RE: Right. Now explain that to your buddy Dennis!(nt) - deathtube 667 05:29:13 07/21/12 (5)
- RE: Right. Now explain that to your buddy Dennis!(nt) - RC Daniel 14:38:13 07/21/12 (4)
- RE: Right. Now explain that to your buddy Dennis!(nt) - Tre' 15:32:11 07/21/12 (3)
- RE: Right. Now explain that to your buddy Dennis!(nt) - RC Daniel 21:08:34 07/21/12 (2)
- RE: Right. Now explain that to your buddy Dennis!(nt) - mach1 17:41:33 07/22/12 (1)
- RE: Right. Now explain that to your buddy Dennis!(nt) - RC Daniel 00:12:30 07/23/12 (0)
- You are exactly on point. Thanks. (nt) - Tre' 10:26:02 07/20/12 (0)
- RE: Electrons do not go directly from the filament to the plate - kyle 20:14:51 07/17/12 (0)