Loud buzz from speakers
I turned on Ashdown MAG 300 amp, and out of the blue came a loud, almost deafening high tone which I can only describe as resembling a seriously amplified electric razor. Anything I do to any of the controls has no influence on the tone, and it plugging in or unplugging bass has no effect. Haven't been moving the amp, haven't spilled any beer on it. It has just been sitting peacefully in the corner of the livingroom, used daily as a home-practice amp. Was wondering if anyone has had a similar experience, or what could be the cause?
I am guessing it has DC voltage at the output socket, indicating a blown transistor or capacitor?