Recently I acquired the same type valve, a CAT9, as used in the final TX stage at Alexandra Palace in 1936, transmitting the Baird 240 mechanical line system as well as Marconi's 405.
I have made four chrome feet for it to stand up proudly as an Art Deco ornament of that period with a picture of the mast it powered up.
Ultra bright LEDs are in the filament well for illumination, nicely bridging the period from those CAT9 days to our present use of ultra brights.
Albert.