120 cycle hum of death!

speakermagnate · Joined: 28 May 2006 Posts: 2

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?

Guest · Posted: Mon Oct 09, 2006 7:31 pm Post subject:

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

speakermagnate · Joined: 28 May 2006 Posts: 2

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