Humming/Buzzing in Aura va-100 ii

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Hi All,

I've been using a '93 Aura evolution va-100 II amp, and recently its buzzing/humming problem got worse. Initially the humming/buzzing used to go away after the amp was heated up for a few minutes, but now it doesn't go away at all (especially due to winter time).

The buzzing is coming from Omron 12V relay, so I purchased and changed it, but the new relay still buzzed right off. So something else is making the relay humming. Interesting thing is, if I hook up my headphone output, the humming stops right away.

What would be the problem? Could anyone tell me how I can fix it please?
 
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