Overnight I ran the new K3 firmware and the HB 540 amp , This AM there was no smoke in the ham shack, so things went well. I'm running this IFR 540 amp on 20 volts , getting 70 watts out , I thought I should get more, The amp was cool to the touch . It's 9:AM local time and just had a decode from WD2XSH/12.