i have a gf 9191 thats humming from the tape heads, when i hold down the edit button it stops, can anyone shed any light on this prob for me , thanks

GEOFF....HAVE YOU CHECKED THAT THE CHASSIS IS GROUNDED....IN FACT , HAS ANYONE BEEN IN THERE BEFORE YOU TINKERING....MAYBE PICKING UP A BIT OF STATIC FROM THE CASSETTE MOTOR....MIGHT BE WORTH HAVING A LOOK AND PUTTING AN EARTH WIRE BETWEEN THE MOTOR CASING AND THE CHASSIS