Rich, if there is plate voltage applied there will be a small leakage
current due to the less than perfect vacuum inside the tube.
In fact, this is a good way to pretest a tube before using it. If the
leakage is more than a few microamps then standby for sparks when the tube is
heated and high voltage applied.
73,
Gerald K5GW
In a message dated 9/6/2012 8:42:55 A.M. Central Daylight Time,
w9cin@comcast.net writes:
I have heard, thru the years that there is electron flow without the
filament or cathode being heated
although it is very little.
with the filament or cathode being heated ,there is a "boiling off of
electrons"so to speak
and the process is greatly accelerated .
make any sense ?
"Rich"
On 9/5/2012 3:58 PM, Randall Mullinax wrote:
>
>
>
> I still ask for an explanation of why the filament or cathode in a tube
has
> to
> be heated to receive the current flow. I've been asking this question for
> fifty
> years. Still waiting.
>
> 73, Bill W6WRT
> _______________________________________________
>
> Excellent!!! I agree.
>
> Randy
> AD5RM
>
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> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
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