The best resource for tube substitution in my opinion is an owner's manual for the later built Hickok testers. It helps confirm pin out, heater voltage and current. Some have tube substitution charts for the more common tubes also.
A lot of good equipment has been hurt by the wrong tube. I always use exact spec when possible.
Brent Jessee' website is a valuable resource also. Lots of info there. When i think about it that's where I'd start . I go there occasionally, I have gear with obsolete tubes
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