I was browsing through a local shop and came across a few booklets that my Amateur Radio friends might find interesting.
Merit Output Transformer Selector
Tube Substitution Handbook
Allied’s Radio-Circuit Handbook and Radio Builder’s Handbook
Sylvania Tube Substitution Manual
June 16, 1928 issue of Radio World
Servicing Radio and Television with a Vacuum Tube Voltmeter
I can scan and upload any of these if there’s interest in them. I don’t really work with vacuum tubes myself, but I’m sure someone out there will find this useful.