Shown first is the Ultra U405. Lower down on the page is the Ultra T401, and many people assume that the T401 is the older of the two receivers, since the T401 cabinet is similar but larger, and the model number is the lower number. That is not the case though, as the U405 was introduced in 1945, a year before the T401. The set is a 4 valve plus rectifier receiver that operated on either AC or DC mains. When operated on AC a half-wave rectifier provides HT current, and when the receiver is operated on DC the heater of the rectifier behaves as a low resistance. Reception is provided on MW and LW only, and in 1945 the receiver cost £15.13.0. The cabinet is made from mottled brown bakelite, with the speaker grille being a white plastic insert. The control knobs are also white to give an updated look to the traditional brown bakelite. Valve line-up is X71M, KTW74M, DL74M, KT74, U74. These valves all have International Octal bases and are designed for "Universal" operation with 13v heaters, excepting the 30v heater of the rectifier.
Shown here is the Ultra T401 from 1946. This set is for operation on AC mains only, and provides reception on SW as well as MW and LW. The cabinet is very similar to the U405, but is somewhat taller with a larger expanse of the white plastic fascia. This reflected the post-war trend towards cream coloured cabinets. Some 10 months after launch Ultra extended the idea further by offering the receiver with the brown (apparently old-fashioned) bakelite sprayed in pastel colours such as cream, blue and green. The sprayed cabinets cost an additional 15 shillings +pt. A frame aerial is wound on the rear panel of the receiver. It can be noticed that Ultra has moved the tuning scale from the right to the left hand side of the cabinet when comparing the U405 and T401. One is prompted to wonder why Ultra did this; did market research suggest people preferred the new layout? It is difficult to imagine that engineering considerations required the speaker and scale positions to be reversed. When launched the receiver cost £13.17.6 +pt, but this was increased to £15.0.0 +pt a few months later. Coloured cabinets cost £15.15.0 +pt. Valve line-up was TH41, VP41, PEN45DD, UU6.
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