[Elecraft] Problem with KPA 100 (no power selection possible)

[Hartmut Kluge]

I enjoyed to build up the KPA 100. Transmit test with 5 watts was ok. But with POWER control set to output 20 watts power rises to 110 watts. If POWER control is set to 11 watts or higher  I  get always 110 watts output with good signal quality, but power selection is impossible.
Anyone have any ideas as to what I should do?

Hartmut
DL5BT
K2 # 5302