[Amps] Zener Screen Regulators

[TexasRF at aol.com]

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 at 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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