{TAIL ~ The error signal} from summer 82 affects the constant speed drive 66 of each channel in {HEAD ~ an identical manner} 
{ TAIL ~ The error signal } from summer 82 affects the constant speed drive 66 of each channel in { HEAD ~ an identical manner }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD