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Re: [Amps] AL80A PROBLEM

Subject: Re: [Amps] AL80A PROBLEM
From: Jim <>
Date: Tue, 20 Nov 2018 11:47:28 -0600
List-post: <>
What are you driving it with? Do you have ALC hooked up? What mode?

Jim W7RY

On 11/18/2018 8:53 PM, BY THE LAKE wrote:
My AL80A began acting up a few weeks ago...nothing serious but baffling. On 160 and 80 mainly, when I tune up with about 30W drive, after a second or two key down grid current jumps by about 50 ma, plate current by perhaps 25ma and power output by about 60 watts or so. I have done all the usual maintenance things and even tried my spare tube but the condition persists. It does not seem as noticeable with higher drive and power output.  Watching the power output meter on my transceiver, a slight increase is visible coinciding with the changes in the amp's meter readings.  Sort of suggests a tube about to go bad?  But two of them, one a little-used Amperex??

The onset of this condition coincided with some reports of an echo on my signal!

Anybody ever run across this type of thing?

Bill VE3NH
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