Hi; The problem with the t w 1 is that it only reads forward and reflected power. It doesn't give you meter information such as plate current or grid drive. Other than Tom's 811 h issue, I have tuned several amps basically for maximum output and there were no complaints about the signal and no issues with the amplifier. Just couldn't go back to a tube amplifier and manual tuner. It was fun back when but changing bands could be more work than it was worth. richard sent from my braille note@