The 10C2 is a VHF television triode pentode frequency changer.
The required oscillator injection is 3.25 volts pk-pk.
Made in England. The location pip can be seen on the metal skirt. The B8A base had eqi-spaced pins and thus a locating pip was vital. On the left of the image, seen through the screen, can be seen the grid wires. Under a glass the construction seems to be the same as the 6K8.
Looking through the holes in the screen the outermost grid winding can be seen. The grid is reasonable close would suggesting that the suppressor grid could be used as a control element.
The thin glass tube envelope is 20 mm in diameter and, excluding the B8A base pins, is 53 mm tall.
References: Data-sheet, 3002 & 1040. Type 10C2 was first introduced in 1952. See also1952 adverts.
