What are you driving it with? Do you have ALC hooked up? What mode?
Thanks
73
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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