The CB VS HAM crap you pushing here don't fly so well.
Sure tubes can be pushed beyond their manufacture recommended limits.
But why would any one with any common sense want to do that?
Shortens life of the tube, stresses the power supply and splatters the band.
The fact is the difference between 600 watts out of a pair of 572B VS 900 watts is not going be heard by the receiving station, but the adjacent frequencies will hear your splatter.
Sure tubes can be pushed beyond their manufacture recommended limits.
But why would any one with any common sense want to do that?
Shortens life of the tube, stresses the power supply and splatters the band.
The fact is the difference between 600 watts out of a pair of 572B VS 900 watts is not going be heard by the receiving station, but the adjacent frequencies will hear your splatter.