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PA oscillation in The Yaesu FT-747/FT-80C


Staff member
Apr 6, 2005
Sierras Near Yosemite National Park
Many Yaesu FT-747GX/FT-80C presents this fault. But it is very easy to repair.

On the PA output transistors base to colector, there are R17 and R18.

Cut the tracks betwen the transistors base and these resistors and install a little coil wound about 5 or more turs over a 100K resistor.

It will cure the PA oscillation.

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Feb 15, 2015
Thanks Jeff, I have the same problem on the YAESU FT 80C, I have tried, and succeeded,

regards 73 de YB3FTD


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