We inherited a Kimball electric organ which has power but no sound. My husband took the back off and found that a white wire at the bottom of the speaker was broken. Where can we buy a white wire, which has foil inside the wire cover, to replace this broken wire?

Solution is to have Yamaha/Kemble repair it for you after checking the mute speaker button has not been moved to mute.

Kimball were bought by Yamaha back in the 90s.
Totally obsolete now.
Sorry.

notify a music repair shop for assistance or a referral for a repair person

Start by replacing all the capacitors, especially the ones in the power supply. That could very well fix your problem, will at least take down your noise

Below is the website for Organ Service Corporation. Contact them for help in acquiring a manual
190 East Washington StreetP.O. Box 372 Marengo, IN 47140
Phone: (800) 457-4408
Email: [email protected]
http://www.organservice.com/index.htm

archive.org/stream/OrganBlueBook-1985-1986.organforum.com/forums/showthread.php?2907-Kimball-Organ/OrganBlueBook1986-Pt.2#page/n65/mode/2up,.organservice.com/kimball/kimball.htm

I think you are speaking of an organ.
Your organ has electronics inside it, and I believe the circuit board for the lower keys has a broken connection.
You should find an electronic organ repair place.
I just looked online and found several places.
Since you may be near to none of these, relay on your computer to find someone who can repair this circuit board.
They will have to tell you how to take it out of your unit.
God bless your efforts.

This can either be an unplugged or dirty connector, or a blown circuit. If possible , get to the connectors on the pedalboard and clean them. If that doesn't fix it, call in a repairman.

This will not be a user serviceable problem. Call in your local organ repairman.