To: | Jeremy Alexander <oaxaca@oregoncoast.com> |
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Subject: | Re: [Amps] W7EME 144 mcs. 8877 problems |
From: | jeff millar <wa1hco@adelphia.net> |
Date: | Sun, 06 Feb 2005 17:03:19 -0500 |
List-post: | <mailto:amps@contesting.com> |
Jeremy... I've seen this behavior with light output loading, which causes the Q of the output network to soar and results in very high circulating currents. All the plate network circulating current flow through the grid ring. The high currents then burn the contact points between the finger stock and the grid ring. Once the contact points begin to overheat, it snowballs into serious problems. The solution is to replace the fingers, polish the grid ring, ensure the finger pressure is high, use as many fingers as possible and always tune up from the more heavily loaded side of the operation...or use very light drive while hunting for the correct operating point. jeff, wa1hco Jeremy Alexander wrote: Aloha to all:
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