Dumble Push-Pull power amps: what really matters?

[roberto]

you can just ignore the current, because there really isn't much there and we're not driving the grids into grid-current, so it is class AB1.

It’s not that easy. You need to drive the output tube that has its own capacitances even in A1. Plus, depending on the tube tou use, sifferent currents give different ranges of linearity.

This is often overlooked in instrument amplification, but still can change the sound of a power amp.

Then yes, if you want to reach A2 or AB2 tou need to have spare current to bring g1 positive compared to the cathode, or simply to reach overload and go back without any blocking distortion.

[roberto]

Lower voltages gives a softer attack with less punch.

That is the point in using the ccs as a tail: define the working point, improve linearity and balance, recover some volt by having the grids referenced to ground, and setting the working point in a more precise way.