Yes - back in the early days of the K3 it did the opposite, it would transmit
more power than requested which was a nightmare for those of us using linear
amplifiers. Some new ALC software was developed which had this effect, but
it was not as marked as you are experiencing. There might be a biasing
problem which could cause this sort of slow build effect, but from what you
say happens when you adjust the power control it looks like it is directly
related to the power setting algorithm. The first thing to do is repeat the
calibration. That may well fix it. 

If not, JT65 might be confusing the ALC algorithm, it may expect a waveform
with some modulation to operate but JT65 has a constant amplitude. If you
key CW does it do the same? I.e. initial Key down, sits at low power,
sending dots goes to high power? What is it like on SSB?

Mike



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