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Goodmans Amplifier Speakers , Humming, Capacitor wrong way still worked for a year!

Had these speakers for just over a year and they have been working fine until one day after the guarantee period they started to emit a buzzing sound on both channels , i instantly assumed that the capacitors were at fault. I opened up the device only to find one of the output capacitors connected the wrong way round. The Positive leg was connected by a fly wire aswell as to the pcb to the heatsink and the negative leg was on the positive. I tested these points with my multimeter to confirm my finding and it was indeed backwards , but i dont see how it should of worked in the first place. The voltage raised to about 41.2V peaked since it was a 50v 3300uf capacitor.. ive never had no trouble until the guarantee period ended.. i dont want to end up replacing the capacitor only to find it blows up.
I dont get it its well strange, ive never known anything like this .

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  • Jonathon summesfield Feb 29, 2008

    Its fixed =].. i overlooked 2 buldging capacitors in the power supply area.. oops. And ive taken ur advice and i have changed the capacitors to 63v and seems to run a bit better now . Unfortunatly both the caps and the diode bridge were backwards , got them sorted now. Cheers.

  • shewes Jul 07, 2008

    I have a Goodman's amplifier which is now about 18 years old. It has never given me any trouble. I have recently moved house and it has been working fine for about a month. I have connected new longer speaker wire to the speakers. All of a sudden, there is a loud humming coming from speakers, even with volume turned down. I have retested with the old speaker wire and also tried different speakers but the same thing occurs - so I assume the amplifier is the problem. I am not competent enough to open the appliance. Any suggestions before a shopping trip?!

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Hi, wow...caps of that value usually go boom real quick when fitted back to front. I too am amazed it has functioned that long. Just double check that incorrect screen printing on the board has not tricked you. Have you put your multimeter across the bottom of it to actually see constant reverse DC volts(ignoring the board markings for now). then replace the offending items, just check that the voltage they are being run at is at least 2-3 volts less than 50v rating of the cap. alot of gear runs really close these days and the supply caps fail early, we see alot of it here in Australia where our supply is 240v you see it at the socket alot of the time at 250-255v Hard on gear designed originally for 220v. I would sub the caps out with 63 volters anyway to be sure of some longevity. Good luck, I am interested to know how you go. Let me know please.

regards
Graeme

Posted on Feb 29, 2008

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