two different output tubes with one negative supply?

[mooreamps]

I stand corrected...

-g

[J M Fahey]

On behalf of mooreamps, I think the confusion comes , not from drawing two tubes on one side of the PP only, but because of the "transformer * drawing shown.
It does not show a center tapped primary (which automatically means push-pull) nor the bottom end is labelled "C.T.".
As shown, a single unlabelled winding , usually means a single ended output transformer primary.
So the confusion is possible (at least, visually).
jm2c