In article ,
Nigel wrote:
Assuming that there's no actual fault, NICAM stereo sound usually drops
out due to either signal strength, or something affecting the signal
going into the TV - for example if the TV is fed by a video recorder.

Dunno the Sony, but on most sets the NICAM is very robust - you'd get
picture problems long before the sound breaks up.

--
*Geeks shall inherit the earth *

Dave Plowman London SW 12
RIP Acorn