And, it is a modern version of the 829, a dual tetrode used in radar service
in WW II.

During the Korean war, the 4D32 that was used in the Viking I and a few
other rigs was grabbed up by the military and none were available for
civilian sale. So, the 829 was stuck in its place. I still have an 829 in
mine. Many came from the factory that way.

The 5894 is a good tube. Besides use in parallel for the rf, it can be used
as a modulator.

73, Colin K7FM