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When I saw the title of this thread, my mind immediately went to plate resistors.
Typically what I'll do is measure the old carbon comps, and then spec out a bunch of carbon films until I find ones that are close to the drifted value of the old CC's. I also save the old ones - bag em and tag em with info re: which gain stage they came from. In the event I have to tweak the carbon films a bit more, I will temporarily sub back in one of the originals.
Many times, folks for get about the B+ droppers on the rail. They can have the biggest affect. I like to start with those.
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