I've found that for most of the sets, since they didn't have a really nice cloth cord anyways I use a brown rubber extension cord. If I recall correctly, most sets used a similar rubber power cord to begin with. (At least for AA5's) I know that philco used cloth at least till '32 I don't recall the year they switched over, but one I have from '37 didn't have cloth.
My only gripe is that most of the cloth cable I've bought, is that it's just cloth over regular wire. The cloth slides around and can completely slide off. It's a pain to work with, so I only use it on certain sets. Hopefully someone knows of better cloth wire.
Here's what I normally get from the hardware store for about $5.
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