Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Yaesu FT-101 is a model line of modular amateur radio transceivers, built by the Yaesu Corporation in Japan during the 1970s and 1980''s. The FT-101 is a hybrid radio that employs a solid state transmitter, receiver, and a tube final amplifier. The tube amplifier consists of a 12BY7A pre-driver stage that feeds a pair of 6JS6C tubes providing a nominal output power of 130 watts peak-envelope-power (PEP) single sideband (SSB), 90 watts CW, 40 watts AM. The 6JS6C tubes are matched to 50 ohms through a conventional pi-output network. The pi-network transforms the 3000 ohm output impedance of the tubes to a 50 ohm feed system, provides harmonic attenuation, and can actually match to a variety of output impedances from 25 to 100 ohms.