The Popular Electronics version predated stereo and used only a
single dual triode, a 6BX7 IIRC, in the output stage to give 4 or 5
Watts
output.

I made an amp with paralleled PP 6BX7, and it sounded great except I
could never get any 6BX7 with matched halves, so I deconstructed it.
I'll probably put 6CK4s in there instead. The two halves are usually
all over the place, which is a problem in need of a solution. Maybe a
CCS underneath, or fixed bias to each half and double the coupling
caps. I tried the latter, but it was just too complex running 8
different bias pots.