I don't know if it's exactly what you're thinking of as 'super cathode'
but the guy here
https://www.tapatalk.com/groups/marc/a-6-meter-400w-linear-t25.html
has something along those lines which he seems to think works just fine.
Steve G8GSQ
Someone had posted that Super Cathode Driven amplifiers are unstable.
Can someone elaborate on that notion?
It does not make since due to lower gain and that screen grid is directly
connected to ground.
I hope in the future to do some experimentation on this design. Goal is one
4CX300Y driving 3ea
for legal limit. Neat thing is that just about all the tx, driver power finds
its way to the output.
This tube has 400Watts plate dissipation.
73
Bill wa4lav
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