ACOM 1500HF Easy to operate The TRI is a powerful tuning aid that, together with the automatically controlled input attenuator, helps the operator to quickly and precisely match the antenna impedance to the optimum tube load impedance (5-10 seconds typically). The auto-operate function (when enabled) maintains the amplifier in the OPERATE mode for you, thus … Continue reading ACOM 1500HF + 6m LINEAR AMPLIFIER