Brian,
I am a new member and very new to audio.  In my effort to come up to speed, I have purchased a book titled Vacuum Tube Audio by Jerry Whitaker and published by TAB/McGraw Hill.  Chapter 4 pg 111 has a discussion that may be of interest.  Perhaps you can find a copy used for a more reasonable price than a new copy.

Ken (k6wkd)

You're welcome.  Had a couple of other thoughts.  Per my elec. engineer friends, Terman's Electronic and Radio Engineering 1947, is the classic.  I have a copy and it is excellent.  In fact, much of the info in Vacuum Tube Audio is taken verbatim from Terman.  Also, the RCA Receiving Tube Manual is a great reference.  Both are out of print but I have good luck building my library from used book sources such as Alibris, Amazon, Barnes and Noble and a number of others.  Sometimes the "old book smell" of some books can be overwhelming in my small study.  I had thought the smell came from dust, mold etc and tried airing, freezing, sunlight, microwave, Lysol spray etc.  No luck.  Then with some archival research, I discovered that the smell is generated by the acids in the paper reacting with the cellulose causing breakdown, hence the odor.  As a remedy, I put the offending books in clear plastic vegetable bags from our grocer. I can still read the titles but the odor is contained.  Books printed on acid free paper do not produce the odor.

Good luck with your library building.
Ken