The development of technology accompanied Klaus Wunderlich in all conceivable areas from the very beginning. The advent of the Hammond organ, the introduction of vinyl records on a large scale, the introduction of stereo technology, and the corresponding devices for every household ushered in a new era at the beginning of the 1960s. With the transition from analog to digital technology, the entire music world changed completely once again starting around 1980.
Vinyl - The End of Shellac Records 
vinyl records
A milestone in the history of sound carriers was the invention of the vinyl record in 1948 by Hungarian-American physicist Dr. Peter Carl Goldmark. In the same year, the US record company Columbia introduced the first plastic record with a microgroove and 33-and-a-third revolutions per minute. This 30-centimeter record was called a “long playing record” or, in German, a Langspielplatte (LP).
Stereo System Stereo
After the end of the Second World War, a radio was standard equipment in German living rooms. Anyone who was anyone owned a tape recorder with which radio broadcasts and the music they contained could be recorded. In the mid-fifties, during the economic boom, radios were increasingly replaced by radio-record player combinations.
The studio of Klaus Wunderlich Studio
Klaus Wunderlich not only witnessed the development of recording studio technology but actually helped shape it. Even during his time with Simpl (biography), Klaus Wunderlich experimented with Grundig tape recorders and achieved the first multi-track recordings through overdubbing.
Here is a very good compilation of the development of sound recording History of sound recording (German only)