After a _lot_ of downloading and reading, I've compiled excerpts from the best tube logic theory technical documents I've found on Bitsavers and uploaded it as a merged document here: http://www.scribd.com/doc/5484436/Basic-Principles-of-Vacuum-Tube-Logic-Cir… I've included two pages on the IBM 650's capacitor memory just because the concept is so cool to me: a tube written, refreshed and read array of 500pF caps. I wish I could find a more detailed description of it. If anyone knows of other documents on Bitsavers or elsewhere that contain quality stuff on the tubular logic topic, please let me know and I'll add excerpts from them.