Not, it is a transmiting tube made in japan by JRC company, in use in
martitime tx.- but unknown other characteristics the this tube.-

Tks. Regards
Heriberto

Heriberto
"cbx" escribió en el mensaje
...
This is a small CRT I believe, 41 means long persistance phosphor as
used in radar (slow scan ham use). They were also used in early
Heathkit spectrum display. I may have one in my junk pile.