Bonjour à tous
In 1960s Sidney S Smith was the audio and analog engineer at Marantz, Dick Sequerra was the RF genius.
In 1971, I had the good luck to work with them at their newly formed Sequerra Co.
Sid taught me a lot about hifi and analog circuitry.
His favorite scope was the 536, which had excellent 11 Mhz XY bandwidth.
Sid would display a lissajous of the input audio vs the output or distortion product of a distortion analyzer.
Just a walk down memory lane....
Jon
Jean-Paul