Mullard describe the UL46 as a video output pentode with a maximum anode dissipation of nine Watts. This is an early production version of this type as it features the metal skirt around the all glass envelope to hold the locating pip. Our other UL46 shows the full transition to an all glass format.
The UL46 is a fairly uncommon valve because it is essentially a UL41 audio output pentode constructed with improved internal insulation to enable it to function as a video output pentode, or a line or frame output amplifier in TV service.
The anode halves are stitched together. Although distorted by the glass tube the grid wires can be seen through the holes in the end of the anode. The discolouration of the glass indicates a hard service life.
The other side.
The thin glass tube envelope is 20 mm in diameter and, excluding the B8A base pins, is 69 mm tall.
Reference: 1040. Type UL46 was first introduced in 1951.