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Re: [Amps]  negative screen current

Subject: Re: [Amps]  negative screen current
From: peter chadwick <>
Date: Mon, 30 Dec 2013 21:17:46 +0100
List-post: <">>
Were that to be so Don, then all screens would emit electrons, which we know is 
not the case. There is a problem between 'electron current flow' and 
'conventional current flow' here. Screens collect electrons generally. The more 
electrons they gather, the greater the screen current measured with a meter 
which has the + terminal connected to the supply. To get that meter to read 
effectively backwards, electrons must be leaving the screen grid in greater 
quantities than they are reaching it.

The question is "Why?" Thermionic emission could be countered by using a 
sputtered layer of low work function material - as was done on the 6J4 grounded 
grid triode with its close grid - cathode spacing, back in about 1944.

73 es HNY

Peter G3RZP 

 Message Received: Dec 30 2013, 07:59 PM
 Subject: Re: [Amps]  negative screen current
 > I too have a problem with this explanation. Electrons gathered by  
 > the screen are 'positive' current flow, no matter where they come  
 > from...
 No, they are going in the opposite direction .
 Don W4DNR
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