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tube coils
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From: Mail Delivery Subsystem
Sent: Friday, September 06, 1996 1:32 PM
To: Landon Solomon
Subject: tube coils
You ask about current flow from plate to filament(sp?) in vacuum tubes... the
truth is (feel free to rebuf me); there is no current flow in that direction.
Hole flow in semi conductors is a mater of spaces seeming to move as
electrons jump from hole to hole, this is how the electrons get thru the
material- by taking the place of the next hole and leaving one behind (thus
the hole hasn't 'really' moved but an identicle hole has apeared giving that
appearence). In a vacuum tube there is no material to move thru... so there
is no 'real' current from plate to cathode (filament). Some books and even
teachers, however, still teach "conventional current flow", this is even how I
think of electricity moving in a circuit. In conventional flow energy goes
from positive to negative, sometimes this is easier to understand.
Well folks,
I'm through preachin!
Landon Solomon
>----------
>From: Tesla List
>Sent: Thursday, September 05, 1996 11:25 PM
>To: Tesla-list-subscribers-at-poodle.pupman-dot-com
>Subject: tube coils
>
>>From major-at-vicksburg-dot-comThu Sep 5 22:18:48 1996
>Date: Thu, 05 Sep 1996 18:26:27 -0500
>From: RODERICK MAXWELL <major-at-vicksburg-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: tube coils
>
>I have not even finished my first capacitor discharge tesla coil and already
>I,m
>looking forward to building a tube driven coil! I've odered a couple of books
>from
>I.T.S. __Vacuum Tubes In Wireless Communication__ by Elmer E. Bucher ,and
>__Vacuum Tube
>Tesla Coils__by J.F. Corum and K.L. Corum. I have built several high voltage
>projects
>using induction coils and a solid state Mosfet driver, but I have never built
>__anything__ that uses tubes.
> In __Vacuum Tubes In Wireless Comunication__ it describes the vacuum tube as
>
>a
>rectifier. It also shows the direction of electron flow from the filament to
>the plate.
>This part I comprehend and understand well. What I have a hard time
>visualizing is
>current flow from the plate to the filament! If the flow fom the filament to
>the plate
>is composed of electrons, what is current flow from the plate to the filament
>composed
>of and what is the mechanism that allows this to happen? Is it simular to hole
>
>flow in
>semiconductor material???? Could someone that has experience with tube
>electronics
>please answer these questions for me so I can sleep nights?
>