[Amps] grid fuses

Will Matney craxd1 at verizon.net
Fri Jul 21 11:04:11 EDT 2006


Bill,

See below;

*********** REPLY SEPARATOR  ***********

On 7/21/06 at 7:16 AM Bill Turner wrote:

>ORIGINAL MESSAGE:
>
>On Fri, 21 Jul 2006 02:30:16 -0400, Will wrote:
>
>
>>How can it collect electrons from the cathode and take a charge when the
>path back to the cathode is broken via a blown fuse between the grid and
>ground making an open circuit? 
>
>------------ REPLY SEPARATOR ------------
>
>Stray electrons within the tube can attach themselves to the floating
>grid and develop a small charge, typically no more than a few volts.
>To prove this to yourself, set up a tube with only filament/heater
>voltage applied and measure the c-g voltage with a high impedance
>meter. You will be amazed.


No, I agree like I said in another post earlier that this could happen, and equilibrium be obtained. What I cant see is the grid taking on any more charge than this thus charging to some other higher potential.


>
>In the case of small receiving tubes, this charge can actually be used
>to bias the tube when operated class A, although this is not really
>good design because of variation between tubes. It's just an
>interesting experiment.


Correct, this would not at all be a good idea for bias.


>
>Bill, W6WRT
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Best,

Will



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