Hello from Belgium.
I found this thread: http://audiokarma.org/forums/index.php?threads/sx-424-distortion-through-left-speaker-none-through-headphones.632675/
I have the exact same problem with an SX-650 but unfortunaly the thread didn't resolve into a satisfactory way of fixing the amp. Leaving me with a severe case of this: https://xkcd.com/979/
Did you fix the amp in the end?
Have a happy new year.
I found this thread: http://audiokarma.org/forums/index.php?threads/sx-424-distortion-through-left-speaker-none-through-headphones.632675/
I have the exact same problem with an SX-650 but unfortunaly the thread didn't resolve into a satisfactory way of fixing the amp. Leaving me with a severe case of this: https://xkcd.com/979/
Did you fix the amp in the end?
Have a happy new year.