Jim Lesurf wrote:


** The beginnings of hi-fi audio occurred in the 1930s, in relation to
film sound. The need for decent sound quality in cinemas spurred the
development of large single ended & push pull amplifiers using triodes
plus two way, horn loaded speaker systems using 15 inch woofers (often
with field coil magnets) and multi-cell tweeters.


Reading old issues of WW from the mid 1930's onwards gives me the strong
impression that domestic 'hifi' in the UK initially grew mainly out of the
earlier interest in having 'better' radios (and radiogrammes).


** Reading old copies of a magazine called " Wireless World " might indeed give one the idea that AM radio was all that existed.

You'll need to fish in a bigger pond to find what kicked off the manufacture of genuine *high fidelity* audio equipment round the world.



.... Phil