Re: superhet
Hi , not sure of their availability in germany of if it should be Philips rather than Mullard, but in the UK Mullard produced a lot of 1 page application notes in the 50's and 60's on valve circuits in radio and TV. These were usally just a single stage circuit such as an IF amp or a discriminator.
Their "Mullard Valve Data Manual" (TV &FM), publishedin 1958 has most of these sheets as well as much other information. It covers a lot of the design of receivers
Ed
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