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120 cycle hum of death!

 
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speakermagnate



Joined: 28 May 2006
Posts: 2

PostPosted: Mon Oct 09, 2006 5:15 am    Post subject: 120 cycle hum of death! Reply with quote

I'm working on Kyocera receiver that is giving a nasty 120 Hz hum. It plays fine and sounds good once turned up loud enough to drown out the hum. All of the ground connections seem fine. The hum is coming in somewhere between the pre-amp section and the power amp.
Any suggestions?
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PostPosted: Mon Oct 09, 2006 7:31 pm    Post subject: Reply with quote

Filter capacitors? Are you sure of the grounds? Coupling capacitors? Failed solderjoints?
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speakermagnate



Joined: 28 May 2006
Posts: 2

PostPosted: Mon Oct 09, 2006 8:52 pm    Post subject: Reply with quote

I found the problem shortly after posting this, there is a small secondary power supply, and one of the filters was bad.
Thanks for the reply
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