Paul Galburt - K2AYZ
I too built a triple 811 linear amplifier (when I was about 15 yrs old). It was grounded grid and the bifilar coil for the filaments was a tricky part - no toroids in those days. It had a surplus roller inductor PI network for antenna matching. Put out about 300 watts on most bands I think.
It did not have a lot of gain, but was super stable, and the glow of the filaments and the mercury vapor rectifiers was great, and all those ceramic plate circuit connectors - I loved that box and wish I still had it.
Ah, the old days - when things glow now, it's generally NOT a good sign :)
This stuff can sure jump start a career - 63 years later I am still at it every day.