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The radio designer "From simple to complex" was produced presumably since 1965 by the Riga enterprise.
Three or four designs can be assembled from the kit, depending on the configuration: a radio detector;
detector radio with high-frequency amplifier;
direct gain radio with single-ended output and direct gain receiver with push-pull output (the latter depends on the configuration).
The diagram of the 4th option is on the packaging box and on the page with the description of the kit, where the radio case is called "Jura".