[Mondial]

Yes, the convention applies to all tubes. The diagram shows the bottom view of the pins, and the pins are numbered clockwise with pin 1 at the lower left.

http://www.classiccmp.org/rtellason/tubedata/1C6.pdf

When you are working on the breadboard, you are looking down from the top and everything is reversed. Pin #1 is at the lower right and the remaining pins are numbered counterclockwise.

Working on breadboards with tubes always drove me crazy just for this reason since you were always used to the chassis bottom view. Then of course came integrated circuits whose pins are diagrammed and labelled from the top view. Growing up with tubes, this required quite a bit of relearning and adjustment!