Jim Lesurf wrote:


I've recently been working though Wireless World issues from the 1930s and
1940s, looking for info on the ancient history of audio/hifi.



** 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.

Westrex and RCA were the leaders in the USA while Vitavox was their equivalent (with speaker systems)in the UK.

Immediately after WW2, scaled down versions of cinema amplifiers and speakers were produced for home hi-fi, with names like Leak and Quad in the UK and Klipsch in the USA.



.... Phil