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Probably bad capacitors, maybe shorted electrolytics. Don't try turning it on again till you fix it or you may destroy your power transformer. You may have an intermittent primary winding in the transformer caused by overheating...most likely cause is due to shorted caps or maybe bad 5Y3.
I would replace all the capacitors in it, paper and electrolytic, and check for bad wiring. I have one of these at my parents house that I bought when I was in high school but it has been a while since I have worked on it. You will need to detach the tuner part and pull it out through the front and take out the amp chassis too. There is also a small sub chassis for the cobra phono preamp.
Start by measuring the resistance on the primary of the power transformer. You should have a few ohms, if there is none you have an open winding.
Last edited by Chad Hauris; 09-18-2005 at 04:00 PM.
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