Just a thought to ponder:
Has anyone ever thought about using 6080s as modders? ? They would prolly need a lot of grid drive, but they have the lowest plate resistance of any tube I know of.
And they are designed to handle high plate currents.
There are plenty of schematics for using 6080's as audio amplifiers out there on the tube audio sites.
They supposedly work very well.
About 8 or 9 watts output from push pull circuits in class a. 2K output impedance on the output transformer.
That would be more than plenty for 807s and perhaps you could parallel two 6080s and drive tubes like 805s. Sure would be cheaper than 2A3s.