Edward Knobloch wrote:

This is the big RCA handbook of receiving and transmitting
tube types, loaded with characteristic curves.
Total pdf size 214 MB:

You should know that Pete Millett has the HB-3 up on the web as well, at
http://www.pmillett.com/hb-3_tube_manual.htm right now. He has it divided
into individual files for each datasheet, which is a pain if you want to
print them all out but kind of handy if you only want to look one up.

note that the HB-3 is a loose-leaf binder handbook, which RCA sent regular
updates and additions to. Not everybody subscribed to the updates and not
everyone that subscribed to them used them, so you will occasionally find
differences between two HB-3 books. Consequently, it's a really good thing
to have several versious available online.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."