>X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.6 (32)
>Date: Sun, 14 Feb 1999 21:30:07 -0800
>From: Loren Moline WA7SKT <firstname.lastname@example.org>
>Subject: [WSVHF] 2 Meter Amp.
>Reply-To: Loren Moline WA7SKT <email@example.com>
>I just finished testing a 4CX250 2 Meter amplifier and had a question.
>The linear uses a #10 wire coil in the plate. It is from the 1980 ARRL
>While I was tuning it up I saw anywhere from negative to 20 ma. of screen
>current on the tube. I am now getting slightly less that 50% efficiency and
>the screen current is running at zero with 1 watt drive and 200 watts out.
>The plate current is 250 ma and the plate voltage is 1750.
>Is the zero screen current a indication of any problems?
>Would I get better efficiency if there was a little screen current.
>This is my first linear constructed so I dont have any experience.
>Thanks in advance.
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