The CV6189 (commercially the E180F) is a special quality UHF pentode primarily intended for use in wideband amplifiers in telephone carrier systems, radar equipment and measuring equipment.
The KB/QDD identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the QDD identifies the maker as English Electric Valve Co., factory location not yet known.
The anode is shaped to present a small flat surface to the electrode stream with a larger area of metal behind to dissipate the heat generated.
The anode is a single pressing. Inside can be seen the rectangular hole of the bright beam plate. The inner grids are shaped to pass flat across the face of the cathode. Note also the double mica discs that confer vibration resistance.
A closer view.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 38 mm tall.
