[Elecraft] Gamma HPS 1a and K2

[cloud runner]

bought the Gamma HPS 1a switcher power supply to power the K2/KPA100 which it does well, with no switcher noise that I can hear.  Tiny thing hardly gets warm.

however... when I key the K2, I hear a high pitched whine from the power supply, the more power I am running, the stronger the whine.  it goes away soon after full voltage has been restored to the capacitors.

Anyone else experience this?

What might it be?

How can it be suppressed?

73,

Fred - kt5x
K2 # 0700
K3 # ????