I've been using a Ca-810 i got in barter town for about the past 1.5yrs without much problem but i noticed the occasionally hum in the speakers which came on powerup and went away. Flashforward and now the hum is there all the time new symptom is now my tape loop outs i used to archive and for a headphone amp are terribly noisy to the point i cannot use them. to my knowledge its never been re-capped, i have given it a cleaning out on the inside and used deoxit on the output jacks and the knobs. Any suggestions on problem spots to check? I'm not well versed in electronics but my father in law is, as long as its a basic fix.