My Father was my electronics repair guy... both musical instruments, and electrical work in my contracting business.. Shipping cost would be too high to send him any of my electrical needs

I would like to add a headphone jack that can double as an audio out to a external power speaker.
This organ does not offer a solution other than a mic'd speaker.
Any suggestions "how to" do this..
#1 I don't want to ruin the Hammond.
#2 I don't want to send a power signal to my external amps.
I would think I have to tap in before the pre amp?
