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You want a low anode impedence..?

if you're stepping up don't you want a lower anode impedence than the 801A?

4P1L is fairly low with a mu of around 11 so you get some gain.

Otherwise maybe a 2a3 at low current - never tried it....

I'd be looking for other solutions, like using a Gyrator with a DHT like Ale Moglia uses - see his site Bartola Valves. That way you get the gain and the low output impedence. He sells the gyrator boards. If you used one of those with a 4P1L it would be a great driver. You could then use your interstage in a preamp, in 4:1, if you wanted to find a use for it.

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