SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

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Electrons do not go directly from the filament to the plate

Posted by Tre' on July 17, 2012 at 08:44:29:
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'