Servo-controlled swiveling phonograph tone arm, early 1980s design most often used by Denon. The drawing shows a similar arm of the Epos-001 turntable (Soviet Union, 1982-1986) which has the benefit of having all important components exposed (the Denons and Sonys had them hidden under the deck). The designers provided an in-depth illustrated description in the January 1985 issue of Radio magazine [1]  Stationary mechanical components   Swiveling mechanical components   Stationary electromagnetic components   Swiveling electromagnetic components (permanent magnets and shutter vanes) 
I Beginning of 12-inch record / II End of record1 Arm pivot axis / 2 Arm body / 3 Magnetic shield / 4 Adjustable counterweight5 Permanent magnets / 6 Horizontal actuator coil / 7 Vertical actuator coil / 8 Horizontal actuator coil9 End-of-record sensor head / 10 Horizontal angle sensor shutter carrier (rotates horizontally with the arm but does not tilt vertically)11 Vertical angle sensor exciter / 12 Vertical angle sensor read head / 13 Horizontal angle sensor exciter (top) / 14 Horizontal angle sensor read head (bottom)15 Vertical angle sensor shutter / 16 Horizontal angle sensor shutter / 17 Tracking force setting dial18 Arm tube / 19 Arm parking support / 20 Cartridge / 21 Headshell / 22 Adjustable dust brush
Own work
Retired electrician