>X-Sender: lmoline@mail.olynet.com
>X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.6 (32)
To: <amps@contesting.com>
>Date: Sun, 14 Feb 1999 21:30:07 -0800
>To: wsvhf@qth.net
>From: Loren Moline WA7SKT <lmoline@olynet.com>
>Subject: [WSVHF] 2 Meter Amp.
>Sender: owner-wsvhf@qth.net
>Reply-To: Loren Moline WA7SKT <lmoline@olynet.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
>Handbook.
>
>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.
>
>Loren WA7SKT
>
>-----
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