Question about Audio Players & Recorders

1 Answer

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 .

Posted by on

  • 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?!


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 1,512 Answers

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.


Posted on Feb 29, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

No base in one speaker

Usually this is because the base driver in your speaker is shot. I have repaired hundreds of amplifiers and have never found just the BASS being low at the output of the amp. If the amp is working, then the likelyhood of the speaker being defective is good. A quick test is to just swap speakers and see if the problem moves to the other channel.

If you have a very old transistorized amplifier, you may have a large value coupling capacitor between the actual amplifier circuitry and the speaker output. This is because the older amps had a large DC voltage at the output of the amplifier and this had to be removed or the speaker would be damaged. This capacitor may have finally given up the ghost and needs replacing. While you are at it, you may as well replace both as the other is soon to go.

My bet is that the woofer in the speaker cabinet has blown.

May 09, 2014 | NAD C370 2-Channel Amplifier

1 Answer

Myryad ma120 power amp,loud pop when switched off

Sounds like a Electrolytic capacitor has failed. Search backwards from the speaker connections inside the unit to the main PC board. Replace the first ones that you come accross that are linked with the speakers.

Dec 15, 2012 | Myryad Z Series Z160 Amplifier

2 Answers

My amp states overload protection and no sound from both front speakers but all other speakers are working

Unplug speakers. Try headphones - are they working? Are speakers correct impedance? If it says 8-OHMs output, are you using 2-OHM or 4-OHM speakers, if so, not good. Sound like wrong impedance speakers or a short in the speaker wiring/connector.

Dec 29, 2009 | Cambridge Audio Azur 540A Amplifier

1 Answer

NAD S300 Amplifer humming

You have either got a bad earth connection, or possibily there's a capacitor failed.
If you can't find a dodgy conection, I would replace the large Electrolytic Capacitors in the power section, they are used to take out 50hz hum in the mains electric, when they go you get that hum coming into your system.

Nov 15, 2009 | NAD S300 Amplifier

2 Answers

AV reciever sound goes off

If it is working fine and then shuts off and gets hot in just a matter of seconds then you are in the process of frying your amp. Disconnect all speakers and recheck your speaker load. Try only one speaker on one channel and then one on the other channel at first. Or better still, while you have all the speakers removed, try listening on headphones and see what happens. It sounds like you have seriously overloaded your output transistors with the wrong speaker configuration. Good luck.

Jan 02, 2009 | Audio Players & Recorders

1 Answer

Cuts out when volume increased

it went to protection mode check your cables first and then check your speakers-and confirm no cable touch each other(try with another speakers had same rating)(watt)--means how much power can get.

Jul 28, 2008 | NAD C320 2-Channel Amplifier

2 Answers

Grounding noise

Pull bottom panel and get some canned air and spray around circuit board .May have a shorted capacitor to ground.Might have to use repair directory on this site.

Nov 18, 2007 | NAD T973 Amplifier

1 Answer

Bose amplifier does not work with a 6 speaker selector

your wall speakers may not be connected.... disconnect each speaker from the selector box and test with a small AAA battery to see if they are connected by putting the battery between each speaker's wires , you will hear it crackle ,then gradually connect each wall speaker onto the speaker connector box . If the first set does not work i suggest there may be a problem with your speaker selector box . Good luck

Mar 18, 2007 | Bose Lifestyle SA-3 2-Channel Amplifier

1 Answer

Sony amplifier power

Hi uscsae, This is usually caused by a blown fuse or a blown capacitor. The fuse would be cheap and easy to fix, the capacitor would be expensive and replacement would be my choice. If you are pretty handy with electronics, unplug it, take the cover off the unit, and look near the capacitor for the fuse. Check the fuse for a break in the wire inside it. You can get these fuses at Radio Shack. Hopefully this is what it is, and will be a cheap and easy fix for you. Let me know how it goes. Best regards, nightdiver

May 27, 2006 | Sony STR-DE595 5-Channel Amplifier

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

738 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio Players & Recorders Experts


Level 3 Expert

98868 Answers


Level 3 Expert

4678 Answers

The Knight
The Knight

Level 3 Expert

69845 Answers

Are you an Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides