Unknown British Tube
|This tube is of British
origin, and was made in the early to mid 1920's, but it is unmarked, and
I have not been able to identify it. From it's size and internal
construction, I believe this to be a low power transmitting tube.
It uses a phosphorus getter, which gives it the red color. This
type of getter usually gives the tube a rainbow coloration (such as
This one, however, seems to have a more even and intense red coloration
The tube is about 2 1/2 inches in diameter at its widest point, and about 5 inches long (including the tip and pins at the bottom). By comparison, the spherical version of the Type "R" tube is a bit over 2 inches in diameter, and about 4 inches long.
If anyone knows anything about this tube, I would appreciate an email.