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Peavey pa 120

My amp powers up but I do not get any sound from any of the channels, just a humming noise. Could it be the capacitor?

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  • 15 Answers

No It wont, is this a new amp you installing or is it already been installed and was working?

Posted on Feb 18, 2014

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Posted on Jan 02, 2017

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SOURCE: Amp Power light will not go on. Protection light is lit- Thump sound in speakers

It probably has shorted output transistors. To eliminate other possible causes, read through the following page.

Amplifier in Protect Mode - Troubleshooting

Let me know if you have any other questions.

Posted on Nov 02, 2008

  • 32 Answers

SOURCE: Peavey PV 8.5C DDT is activated on channel A even

Check your speakers and Cables. I had some speakers that traveled in my small trailer and the vibrations of the trailer caused the diaphram to back off my horns. Once I got the speakers fixed the DDT light on my power amp stopped staying on so much.

Posted on Jan 20, 2010

  • 5603 Answers

SOURCE: my peavey 5150 2 will power on but no sound....

It APPEARS that the preamp tube heaters are run from DC source while the latter ones and the power output tubes are run on AC.

Check the 6.3 volts AC going to the power amp tube.

That heater power is fed through fuse F2.

I suspect you will find that fuse has a bad fuseholder or is blown. A failure in the transformer is possible and I hope that is not the case.

A heater short in a tube is possible but doesn't happen often. Replace the fuse ONCE only and if it blows again investigate why. Could be bad wiring or a bad socket or an internal short within one of the unlit tubes. Thoose are rare but still possible.

Posted on May 08, 2010

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Klh powered subwoofer model ASW10-120B... when you plug in to power... it makes a loud buzzing/humming noise


I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.

If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.

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Hello,

I need a bit more information but from what i can tell it's about the power supply capacitors issue, as this devices are known to develop such kind of humming annoying noise when they go under the specified value, let me know further,
Regards.

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How do i get rid of the 60 cycle hum on our building PA speakers? We are using a Speco PBM-30 amp. A two-way radio audio is the feed.


That sounds like mains hum! Most amps have large electrolytic capacitors to take it out. They can go faulty and let it in. They are high value often around 2,200 or 4,700 UF or higher.

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I want to no wat this parts number is Q4025p for a peavey cs 800


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You would send high as well as low to the sub and unless the sub had a built in crossover it COULD get muddy sounding. The specs SEEM to indicate the 118 DOES have a low frequency crossover so it SHOULD be OK... How would it sound? An 18 inch sub normally adds to the sound of a system... You MAY need to PAN over to send more power to the one side with the extra load on one side. Often people use two sub's... one for each side so it is balanced.

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1 Answer

Peavey 8.5c amplifier. One channel dead. In


FIrst of all, in bridge mode there is only one channel. The "bridge" means that you combine the two channels together to get a single more powerful amp. The swollen part is probably nothing. Sometimes the plastic caps cup like that. Unless there is a specific problem with the amp, don't worry about it. Try placing the amp into stereo mode and testing each channel. If both work, there is no problem with the amp. If for some reason you need repalcement capactors, contact Peavey directly. They supply replacement parts.

Dan

Mar 19, 2009 | Peavey Audio Players & Recorders

2 Answers

Ive bought a Peavey 1500 pa amplifier and would like to know are the a b knobs on the front treble and bass.If they are how would I take the outputs at the back of the amp to my Soundcraft mixer.


The Peavey A/B controls are output gain controls. Your mixers stereo output goes into the amps inputs, channels A & B. The Peavey is the output stage to your speaker system. If you you connect the outputs from a power amp to the inputs of a mixer you will blow the mixers input stage, amongst many other things and possibly damage the amplifier too. The bias (Bass, Mid, Treble controls) are on the mixer, not the amplifier. Unless you are using a mixer amp, which you are not. A PA system DOES NOT work in the same way as an intergrated hi fi amp.

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Peavey keyboard amp--Hum takes over all operation


Hi There,
Hum can come from all sorts of places in an audio amp system......
The shielding on the input cables may be broken.
An earth somewhere can be broken....which then allows "ground loops" to form and unbalances the earthing...causing HUM....

Your note about reducing the controls to zero and the hum is still there leads me to believe that the power filter capacitors or some other filter capacitor in the DC supplies have dried out.
Capacitors can also go "open" which can cause low level sound and HUM.

The motto is "Capacitors get "old" and cause hums"....
It looks like its time for a full service....the amp has done you very well over the years and its like anything else needs a service now and then to maintian the quality of sound expected...If there is one capacitor showing you its getting "HUMMY" then there will be others in there as well needing replacement....

High heat can kill an amplifier so while its getting a check over there will be checks for other problems in there as well..Hot running resistors which can dry out adjacent Capacitors...

Cheers for now YUBEUT

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PEAVEY GUITAR AMP RENOWM 400


What type of noise is it making? If it sounds like a load hum, you may have a 60 cycle hum issue. This is caused by a capacitor not filtering out the 60 cycle ripple on the DC voltage supplied by the power supply. If you have this problem I would suggest measuring the power supply with a DC voltmeter first and writing this measurement down. Then I would suggest you plugging the amp into an isolation transformer and taking an oscilloscope (plugged into the wall)and measuring the DC voltage while the oscilloscope is set to AC if you see an AC ripple voltage higher then .1mv you have a bad filter capacitor or a bad voltage regulator.

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