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I'm having "speaker hum" issues

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  • Jerry Goggins Nov 08, 2010

    That's great news about replacing the capacitors to eliminate the speaker hum. I have some experience with electronics, but let me ask the question: I assume that these capacitors are attached to the power supply of the amp...is that correct? Are they reconnected by soldering?

  • Jerry Goggins Nov 08, 2010

    I took the cover off of the RCA amplifier, which is a model RT2400R, SN 947200233. Could you tell me which of the capacitor(s) would likely be the cause of the speaker hum? I've enclosed a high resolution photo of the inside of the amp, which you could use to identify the likely failed items.

    I did some research on the appearance of failed capacitors. None of the capacitors in the amp show any sign of failure.

    If I can't replace the capacitors, then I'll probably need to replace the amp.

  • Jerry Goggins Nov 10, 2010

    Actually, I finally decided to replace the amp entirely. I had previously disconnected everything (cable, TV, and DVD/CD player as well as the incoming cable signal) and connected only the old amp and still had the hum. Your other technician's suggestion-to replace all the capacitors in the old amp-was something I was prepared to try, but I was able to get a new Onkyo unit for less than $200. The Onkyo has features that I do not have on the old amp (A + B speakers, a better tuner, and HDMI connectors, among others.)

    Your company does a great job on these inquiries. If I have hum problems with the new amp, I'll get back to you. I'll leave this issue open for the next week or so.

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  • Master
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The possible problem at your case is a "ground loop". Although you didn't mentioned all the devices on your system, let's try to solve it. Unplug every mains power socket from the mains and isolate the ground connector so that can not reach the mains ground connector (sorry but I don't know where are you from, for example if your mains power plug is a "shuko" type, use isolating tape over the ground metal on both sides). This has to be done on every device power connector; not at the mains power cable that is connected at the wall socket. Check the results. Usually this trick works in order to elliminate the "ground loop effect" that is causing this low hum that you can hear to. If this solves your problem I suggest you to either use the isolation tape on all devises' power sockets except the amplifier (that can be connected with the right way) or use a custom made multi power socket without using the ground connectors for all the devises except the amplifier.

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Posted on Nov 09, 2010

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  • Master
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It's the hum of the mains: the electrolytic capacitors inside the power source of the amp have aged, they dried so their capacity has lowered so they are no longer capable of filtering the current properly.
No need for a new amp, just replace the capacitors - less than $25 for all of them.

Posted on Nov 08, 2010

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  • Azrael SRL Nov 08, 2010

    Yes, they are soldered in there. Make sure to get identical replacements.

  • Azrael SRL Nov 09, 2010

    The capacitors didn't failed, they AGED - normal behaviour. They aren't defective, just that with the passage of time their capacity has decreased so they can't filter the current as they used to. You should replace all, it's a cheap and easy fix.

  • Azrael SRL Nov 10, 2010

    In that case please don't forget to select the answer that helped you most.

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