Musicman Stingray 3 band EQ - on first powering up has a very faint distortion but which within seconds builds up and after about a minute sound goes off and there is a pulsing tone. Has anyone encountered this before?
Fresh battery (twice), leads, cabs and amp swapped and tested so not them. Bass has been stored in its case (sans battery) for about 4 years.
Any insight gratefully sought.