The Radio Amateur's Handbook (ARRL) 27th edition (1950) has several designs
including a push-pull 813 amp but I haven't found a single 813 design yet.
About that time perhaps...

"Steve" wrote in message
...
A while ago I bought a homebrew amp (80-10 meters) that uses
a single 833A tube. Its beautifully built. So far I have not been
able to find any plans or schematics for an amp that uses this
tube. Has anyone seen an article in QST, Ham Radio, or other
magazine of an amp using an 833A? No luck with a web search.
TIA
Steve W6SSP
p.s.-it has a tuned grid circuit