Gary Surrency provided part of the answer.
He suggested that I reset the bias adjustment and re-calibrate the SWR
bridge. After doing this, I'm no longer getting hum on 80m, and on
160m, the hum is reduced.
So, if any of you do the KPA100 upgrade, be sure to re-do these
calibrations.
On A
Your idea of hum coming from higher current sounds plausible here, Bill.
You didn't say what your K2/100 is actually drawing but, yes, mine draw more
current on 160 and 80 than on most other bands.
I plugged in a dummy load and here's what mine requires at 100 watts on each
band:
160m = 17.5
During a recent contest, I received a report of poor signal quality on
my CW signal on 80m.
I've run some tests and find that on 80m and 160m, there's a distinct
hum on the signal when running over about 80 watts. I've also noticed
that the current used seems to jump in discrete steps as I i
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