magazine changed in print format from march 1941 till the
end of WW2, to a Gestetner printing process. This is a much poorer
quality printing process but also much cheaper.
This change was required because the companies that placed advertising in AR magazine did not believe that the magazine would be widely read, due to many Amateurs being over seas fighting in WW2. They withdrew their advertising support and Amateur Radio magazine was forced to greatly reduce costs by using Gestetner printing.
Also with amateur transmissions stopped during WW2 there would be less to write about but a dedicated group continued to produce AR magazine throughout WW2.
The first edition of the cheaper format is below...