The KT45 is rated as an audio output device with over 7 Watts output from a single stage. But the peak anode voltage is rated at 8,000 Volts. This clearly marks it out for duty as a line output stage in television type applications and indeed this was its intended use. The maximum anode dissipation is 21.5 Watts.
The KT45 appears to be a re-issue of the pre-war KT44 and has identical ratings but a different construction.
The open ends of the anode allow the wire grids to be seen. The grids are shaped to pass flat across the cathode. Below the blacked anode can be seen the bright beam plates to repel the secondary electrons knocked out of the anode by electron bombardment.
The GEC logo indicating that this M-OV valve was made for sale to professional not consumer customers.
The top mica with extra insulation for the anode afforded by the ceramic inserts.
The classic envelope is 50 mm in diameter and, excluding the B7 base pins, is 125 mm tall.
References: 1043. Type KT45 was first introduced in 1947. See also1947 adverts.