Technical Description
The 1971-1977 FT-101 types were equipped with an amplifier consisting of a 12BY7A pre-driver stage feeding 2 6JS6C television sweep tubes providing a nominal output power of 130 watts peak envelope power in single sideband, 90 watts continuous wave and 40 watts amplitude modulation. The 6JS6C tubes are matched to 50 ohms through a conventional pi network. This transforms 3000 ohm output impedance of the tubes to a 50 ohm feed system, provides harmonic attenuation, and easily matches to a variety of output impedances from 25 to 100 Ohms.
The 1978-1985 FT-101 types were quite different. They only had the HF, pre-mixer and oscillator units as plug in circuit boards. The IF and audio boards were connected by plugs to a centralized wire harness. Its power supply unit was directly soldered and fixed to the same wire harness. Although the newer types lost their fully modular circuit board buildup, their reliability and ruggedness were outstanding. They were equipped with a very sensitive receiver, a very linear VFO which made flawless operations in the AM, SSB and CW modes possible. Its tube amplifier still had the same 12BY7A pre-driver but the final tubes were replaced by 2x 6146B tubes, slightly reducing its maximum power output from 130W to 115W PEP SSB, 75W CW and 50W AM or FM.
Read more about this topic: Yaesu FT-101
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