[Elecraft] K3/100 TX problem on 20m

[Paul Kent]

My K3/100 gives a high DC current warning when transmitting on 20m with power settings above 75 watts. Maximum output is about 80 watts and is unstable. All other bands perform normally with full 100w output and normal current draw. (50 ohm dummy load) I have done the TX gain and wattmeter calibrations, finding no issues and with no change in symptoms. The output LPF is shared with 30m and I replaced all the capacitors in that circuit, also with no change in symptoms. Any ideas on what may be causing this problem?
Paul, K0PK
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