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I have a low hum with my Carver M 400 amp. How do

I have a low hum with my Carver M 400 amp. How do I fix it?

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If the hum disappears when you unplug the input audio cables, you need to use BALANCED lines to the amp. Read up on balanced lines and XLR connectors and TRS connectors. Find the subjects of those on google.

Posted on May 16, 2010

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SOURCE: I have a low hum with my Carver M 400 amp. How do

If it is accros both channels (on every imput) your best bet is to replace the large electrolytic capacitors in the power supply, these filter out the 50/60 Hz hum from the mains, so they might have failed. Electrolytic capacitors anywhere are good at causing hum!
If they are say 4700UF at 50Volts, you can replace them with any UF rating higher than that, and the same with the voltage. Never go lower than the ratings marked. Also keep an eye out for the temperature rating. It will be given marked "c". If it says 105C then replace with one the same, though it will work with a lower rating it will fail faster than normal. The only problem with electrolytic capacitors is 'space' to fit as they come in many different sizes. So bare that in mind when you a tracking down replacements.

Posted on Mar 22, 2010

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Is it normal for carver power amps to have a slight hum? I have a carver-55x


Hum can come from a jillion different places. Is this hum coming from the unit with no speakers connected, or is it heard through the speakers? What sources are being used? What cables? Are thereany common sources of interference near? Troubleshooting is difficult without much information.

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1 Answer

Carver amp started making a low fluttering sound.


I have a Carver amp which developed a "hum" also. As a troubleshooting step only (long term this is NOT a solution) you can use a ground plug adapter that removes the ground lug from the unit. This is an adapter that has THREE (Line, Neutral, Ground) female sockets for the amp to be plugged into, and TWO male plugs to go into a wall socket. If the buzz goes away, you've got a leaky capacitor in the Power Supply section of the amp. It will take some doing to actually fix the problem, but this will narrow down the cause.

May 27, 2010 | Carver PM950 Amplifier

2 Answers

I have a low hum with my Carver M 400 amp. How do


If it is accros both channels (on every imput) your best bet is to replace the large electrolytic capacitors in the power supply, these filter out the 50/60 Hz hum from the mains, so they might have failed. Electrolytic capacitors anywhere are good at causing hum!
If they are say 4700UF at 50Volts, you can replace them with any UF rating higher than that, and the same with the voltage. Never go lower than the ratings marked. Also keep an eye out for the temperature rating. It will be given marked "c". If it says 105C then replace with one the same, though it will work with a lower rating it will fail faster than normal. The only problem with electrolytic capacitors is 'space' to fit as they come in many different sizes. So bare that in mind when you a tracking down replacements.

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1 Answer

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Carver CT-28v Tuner preamp - Has a hum/buzz (soundls like a ground loop) that is heard as soon as the unit is turned on. Does not increase with volume, just stays the same and is continuous. Changing...


Reverse the polarity of the AC plug and try it. Is there a headphone jack on the preamp? Try headphones with the preamp standalone without the amp attached.

Are you sure the preamp is the problem? I assume you also have an amp or you wouldn't hear anything. Power up the amp with nothing but speakers attached. Hum??? It's in the amp. No Hum? Attach just the preamp with no external components. Hum now? It's the CT-28. Turn it off an exercise every switch and knob throughout its range numerous times. Try again. Still humming? Manipulate source selections, Tape Monitor, everything.

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Best amps for bose 901


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1-shut down all flourecent lamp and check.
2-check for your cables in a good condition and no touching of wires to the body of amp.
3-connect(ground loop isolator)code number(270-054)from radio shack near you and connect it between your audio device(like cd player and amp)

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1 Answer

Carver M-400 popping and no audio


Sizable sparks at a cap~ base?? That sounds like there may be a dead short somewhere and/or catastrophic failure of the caps~ (not always visible on the components, use a multimeter to check the terminals if they are shorted.) If there is noting else that has failed in the amplifier other than the power supply* (*if applicable), it is repairable. Otherwise good luck finding the other fault(s)*.

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