Weird power amp wiring

[Leevi]

What is the idea of the following power amp wiring?
The cathodes and screens are connected to the OT instead of plates and the CT is grounded.
/Leevi

[Williamblake]

Negative screen sag? Building a hifi amp? More impulse current? Less compression?

[pdf64]

The OT secondary provides some resistance for bias voltage (mixed), and feedback, probably negative.
There’s a Leslie with something similar.
Also seems something weird with the rectifier common return via the OT secondary half winding.

[PRR]

The plates ARE connected to OT... through the DC supply.

It is essentially a McIntosh with the complexity moved from OT to power supplies.

Or the ElectroVoice competitor to the Mac.