WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
All agreed. The only issue of dominate plate poles is they also reduce the drive capability at HF to the output grids. Thus you can end up with HF distorsion in the driver stage for large signals. I call it the 'valve sound'.