I believe you'll find one is power [+] and the other is to the speaker - ground happens thru the case from the mounting - for the dial, you'll hafta open it up and look - may be broken string
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
