It takes a minute to search for the 803 data sheet on google:

http://hereford.ampr.org/cgi-bin/tube?tube=3D803

I used that tube many years ago. It is pretty similar to an 813, but not =
recommended above 20 MHz.

Tony, I0JX

"real-radio-ham" ha scritto nel messaggio =
...
HI,
=20
Has anyone any info or a data sheet for a type 803 valve?
=20
I looks like a large pentode, just a little taller than a 813.
=20
RRH
=20