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? How to Calc optimum grid Leak R?

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In this case, I am trying to determine the optimum Grid Leak Resistor for my 1626 output tube.
Just for clarity, this is the grid-to-common before the grid stopper (if applicable) in a cathode biased RC coupled SET. 1K cathod Resistor.

I know that generally for any tube 1 Meg is usually considered max, and I've been reading about grid currents etc, but the spec sheets on the 1626 are vague, and like I said, I'd like to know how to optimize this in conjuction with coupling cap sizing.

I've read the Morgan Jones section on this, but it's not making sense to me, at least not with the specs I can find.
It seems like this is an area that has not been written about much, but is a significant one, and is of value for any amp designer and any tube, especially it's roll in freq and acting as part of a voltage divider?

thanks,
robert
BTW, I've been using 270k just because that's what everyone else is using ;)

Edits: 11/02/09   11/02/09

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