The CVX2209 is a miniature HF pentode. Not having found separate details for the CVX2009 we have used the CV2009 as a model assuming that the X indicates a selected valve.
The KB/EN identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the EN identifies the maker as Thorn-AEI, Sunderland.
One of the two anode plates, the joining strap is on the left. The suppressor grid is close wound allowing it to be used as a second control element.
This image compares closely with the image of 6F33.
The thin glass tube envelope is 18 mm diameter and excluding the B7G base pins, is 45 mm tall.
Reference: Data-sheet. Type CVX2209 was first introduced in 1952. See also1952 adverts.
