The link you provided is to a fixed bias cathodyne version. On that schematic the phase inverter is AC coupled to the gain stage. On this version: http://www.el34world.com/charts/Sche...peg_GS12R_.pdf the cathodyne is direct coupled to the gain stage.
The AC coupled circuit probably has the most headroom. In the direct coupled version the plate voltage of the gain stage must be set lower than normal to prevent clipping of the PI. Bandwidth is a function of bias current and capacitance. Capacitance is fixed by the tubes used and the layout so higher current means higher bandwidth. The AC coupled version gets the gold star because of the lower value resistors set the currents higher.