I have some schematics around for single/dual 811A amps, they are old and intended strictly for 10/11 meters, there are also quite a few on the net, both multi, and single band.
Maybe its time to up the ante on your hobby, and build one, its not terribly difficult, only thing is safely handling the High Voltage. If you scrounge parts you should be able to do it relatively inexpensively, Even the plate transformer for such an animal could be had cheap, or possibly even free.
I can't entirely disagree with the other comments, but I do know your goal is probably not sinking 700+ dollars into this.
Another option is to watch Ebay, old 811 builds pop up relatively often, sometimes dirt cheap, would be a great source for parts.. Might get lucky and score an old amp in working condition as well.