The CV1443 is a directly heated full wave rectifier. The output rating suggests small equipment use such as radio receivers.
The maximum reservoir capacitor is not quoted, the maximum output current is 60 mA. The 4.0 Volt heater is characteristic of the 1930s British heater standard.
The KB/F identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the F identifies the maker as STC, Paignton.
The construction follows the typical pattern with a wide anode and an inverted V coated ribbon filament within.
The horizontal rods connect the filaments in parallel.
The ribbons are maintained under tension by the top springs. The white oxide coating is clearly seen.
The classic envelope is 44 mm in diameter and, excluding the B4 base pins, is 97 mm tall.
