[Amps] screen grid current dropping

Bill, W6WRT dezrat1242 at yahoo.com
Fri Jun 12 07:43:29 PDT 2009


On Thu, 11 Jun 2009 18:33:29 -0400, "ka1mwp" <ka1mwp at comcast.net>

>The current drops from 20 or so ma down thru 12 with the voltages and
>output watts staying pretty close to values.


Every amplifier I have ever owned has exhibited current drift similar
to what you have seen. When you apply power, literally everything in
there starts heating up and heat causes expansion. It happens within
the tube, the tank circuit, everything. What you are seeing is just
the net result of it all. I wouldn't worry about it. 

73, Bill W6WRT

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