Sony amp model:TA-AX285,year:1990 (guess),when the external tuner is plugged in (has special shaped plugs) the +12v shorts out of the 7812 three lead regulator I cannot isolate the problem to either tuner or amp I checked many components on both units.Anyone have any common repair tips?.Thanks in advance.
Sidney E-mail:sidneybek(at)yahoo.com Dartmouth,Nova Scotia Canada