FT-991 Bad AM Audio Quality

The FT-991 actually has a false start. The early series of the FT-991 suffered from a failed output stage and poor audio quality for AM . It is claimed (probably wrongly) that this would set a wrong bias. However, gives the repair expert that it is very likely that there has been a bad production run of RD100HHF1-101 FETs. This allows the RF amplifier was not working properly. The consequence of a failed FET in the output stage is that the quiescent cu