The CV5201 is a miniature grounded grid triode with a 2.5 Watt anode dissipation for operation into the UHF at 550 MHz. The CV1763 is given as an equivalent and the CV5201 is probably a slightly revised version.
The KB/LB identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the LB identifies the maker as CSF, St. Egreve, Grenoble, Isere, France.
The CSF logo and this exhibit was made in France.
The central double sided cathode and grid sits between a pair of channel anodes. The bright strap looks like a thick white line across the centre of the image.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
