The Beatles were the first to go outside the usual usage of console hardware in the studios which really riled the white coats (yes back then the British recording engineers wore white coats) and they had strict rules about what could and couldn't be done. According to this article from 'The Beatles Bible'
https://www.beatlesbible.com/songs/savoy-truffle/ they overloaded the front end of the console with not just one but two 'high gain' amps to get George's sound.
The Beatles were also one of the first to go outside the 'normal' bounds of eq usage as well.