My name is Carlos Barrera , live in Stockholm-Sweden, I have a Revox b790 and I have a problem when pressed the button to raise or lower the cartridge (lowering/lifting), start a mild buzz ;even with the turntable motor stopped, and without the needle touches the vinyl disk . I tried the turntable into 2 different amps, with 3 different cartridges, 3 different cables and connected the ground wire , but the noise continues . The buzz is mild, but more is heard at the beginning and end of each sound track .