First I would like to show you the queen of the collection - my power amplifier for 50MHz. It was designed by my son, LZ3UF. This thing weights only 2kg but delivers 500W output peak power with -30dB third-order IMD, destroying S-meters and loudspeakers around the globe and even further. It uses Russian-made tube GU74, shown on top of the stage. The power supply weights another 25kg and is hidden under the desk. I can easily hide the amplifier as well, claiming it is actually my vacuum cleaner.