[Amps] AL80A PROBLEM

[John Simmons]

And what happens to the SWR (or reflected power) when this happens?

-John NI0K

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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