[Amps] Fw: "Tubes 201" - How Vacuum Tubes Really Work

[Will Matney]

I should have added; On that, I agree it's the only way to make one positive (for only part of a cycle on a grid driven biased grid). A grounded grid, cathode driven, cathode at ground potential tube though, I can't see the grid being positive. Here, the electrons flowing through the tube is varied by the signal, and those same electrons are what travels to the grid to charge it. In this case, the grid is being bombarded by electrons. If the grid was less negative, it world attract electrons until a balance was reached then repel them. The voltage on the grid could never raise above 0 Vdc as I see it.

Best,

Will


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On 7/25/06 at 2:15 PM Will Matney wrote:

>Peter,
>
>On that, I agree it's the only way to make one positive (for only part of
>a cycle). Are there any other ways to make the grid positive and the grid
>be at ground potential with the cathode at ground? A lot of amps cathodes
>are at ground potential unless biased.
>
>Best,
>
>Will
>
>
>
>*********** REPLY SEPARATOR  ***********
>
>On 7/25/06 at 8:04 PM Peter Voelpel wrote:
>
>>Nothing is easier then that if the cathode is going/driven negative with
>>respect to ground.
>>Grid voltage is always measured from grid to cathode, not to ground.
>>
>>73
>>Peter
>> 
>>
>>-----Original Message-----
>>From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
>>Behalf Of Will Matney
>>
>>please explain how a grid becomes positive when tied to ground?
>>
>>
>>
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>
>
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