In the course of seeking art work from vintage tube cartons, I stumbled on a great site with lots of vintage ads for radios and equipment from the 20s thru the 50s.
It's the Duke Unive. Library.
Enjoy!
http://scriptorium.lib.duke.edu/dynaweb/adaccess/radio/1940-1945/@Generic__BookTextView/5877;nh=1?DwebQuery=radio--radio+tubes+OR+radio--tubes#X
Rich