Wartime Civilian Receiver Codes
The Civilian Wartime Receiver was built by 42 different manufacturers, and each manufacturer was allocated a code number commencing U. The "U" numbers were known only to the wireless Trade, and enabled service engineers to identify who had made the receiver, as although the design was standard, some manufacturers incorporated minor modifications. The valves for the set were made by most of the current manufacturers, and no makers name was placed on the valve. However it was possible to tell who made the valve from a code number known to the Trade, which enabled replacements under guarantee to be made. By way of example of the coding system in operation, Murphy Civilian Wartime Receivers were designated U7, and featured a valve line up of 21x, 24x, 26x & 27x, where x is the manufacturer's code number (see table below). For reference purposes these valves are electrically similar to UU5, OM6, EL33, OM10.
Valve Manufacturers Code (Final Digit Of Valve Number)
Receiver Manufacturers "U" Code
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