Yeah I did not look close enough, however it has four tube stages two anodes per tube.
I just glanced at the block diagram and the circuit has four independent tube sections.
We used a lot of these tubes in single tripod RF radio application it was a hot environment and we were leaning on them and needed the plate dissipation. They were a couple of bucks each back then.
Peavey saved some money by using two of these tubes for this application and it works well for this unit.
So yes two tubes.