Here are various documents from Raytheon. Some are internal documents and some are for the general public.
Raytheon 1937 Radio Receiving Tubes - A 1937 Receiving Tube Databook with lots of application information.
Raytheon 1940 Characteristic Data Chart - A listing of Receiving tubes, ballast tubes, and miniature lamps in chart form.
Raytheon Blackwell 1944 Pentode No 3 Grid Mutual Conductance Characterisitcs - A study of the transconductance from grid #3 to the plate of various RF pentodes: 78, 6S7G, 7B7, and 6SD7GT.
Raytheon Freedman 1944 Correlation of Weight & Diameter for Various Grid Winding Wires - An analysis of diameter (in inches) versus density (mg/200 mm) for eight different types of grid winding wire.
Raytheon Blackwell 1944 RF Pentode Rp and gm as Affected by Number 3 Grid Pitch - A study of the effect of varying the grid #3 pitch (turns per inch) on the mutual conductance and plate resistance of these RF pentodes: 78, 6SD7GT, 7A7, and 7B7.