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It depends on what stage of the amp....

Posted by wheezer on October 6, 2008 at 11:52:13:
Here's my experience:
For front end (signal) tubes that draw low current. High H chokes and the DCR should also be rather high. How high.... you don't want to starve the front end tubes. Been there/done that. My front end tubes pull 18mA. I've tried 5H, 12H and 30H, all varying amounts of DCR. By far the 30H sounded best and swept the best, but 600ohm DCR is too much and did starve the tubes. As you go up in H, the DCR follows. Maybe there's a reason for this?
As for OPtubes, high current needs low H and very low DCR. "typically" 2-5H and very low DCR. As you go down in H so goes the DCR. maybe there's a reason for this?
Have a stash of varying sized chokes on hand, listen and sweep the amp.
Check out some vintage amps schematics.