Question about Pyramid XPA200 Amplifier

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Humming noise thers a humming noise in the out put channels after it plays for awhile how can i fix this?

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Re: humming noise

Make shure your wall socket is grounded.Pull cover and look for black and wite and green wires on the back of the plug.Also may have leaking capacitors in final output stage may need a repair man look at the directory on this site.

Posted on Dec 01, 2007

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Why i can hear faint sound on my mixing amplifier

Depends on what sound it is. If it's a hum, then it could be a fault. If the hum is on one channel then the place to look is that channel. You can compare the good channel with the bad one for clues as to what.
If it is in both channels then you are looking at the power supply. Or something common to both channels.
Hum is most often caused by Electrolytic Capacitors.
Crackling noises are caused by resistors, or transistors, or IC's.

Jul 01, 2016 | Amplifiers & Preamps

1 Answer

Peavey cs 200 X

Disconnect the input to the amp on the humming channel. If the hum still exists then there is probably a bias problem in the out put section. Check to see if there is a DC voltage on the speaker with no signal applied.

Jul 04, 2014 | Amplifiers & Preamps

1 Answer

Hey Guys I have a Marantz PM493 amplifier and when trying 2 play the radio through the phono sockets all I get is a loud humming noise but if I turn the volume up very loud I can faintly hear the radio...

If they are marked "phono" then these are dedicated for the use of a turntable and one which will use a magnetic cartridge. You should use ones marked "tuner" or any marked "aux". Even a "tape in" would be better.

Aug 25, 2013 | Amplifiers & Preamps

1 Answer

Noise from channel out

Unless the main amp is based around a single IC power amp which outputs both channels, in which case it will need replacing. Then it's likely to be something to do with the power supply. If the noise is a hum, then it could be the filter capacitors in the the power supply. These will be the biggest ones. There could be one or more of them replace them all.

Jun 18, 2012 | Amplifiers & Preamps

1 Answer

My su-g95 technics Stereo integrated amplifier wont play any noise. and when i adjust the volume it makes a popping/crackling noise. i am 100% sure all the speakers were hooked up correctly.

Well it sounds like your amplifier IC's are working correctly since you are hearing that pop. I have the same amplifier and every 10db increment it pops. Have you tried every input? Possibly try starting at a low volume, plug an RCA plug into CD or any other input, and touch the center prong of the other end of the cable. You should get a 60hz hum if your in the USA, otherwise it will be 50-55hz. Regardless it should make noise.

Sep 29, 2011 | Technics SUV500 2-Channel Amplifier

4 Answers

I am trying to bridge two macrotechs 1200 and I am getting a loud huming noise . No sound. Just that noise. When I run them in stereo mode they work perfectly fine. What causes that?

Let's review the setup procedure and precautions. This is for bridging the amplifiers within a single box.
  • The mono-stereo-bridge switch must be in bridge position
  • The input signal must be connected only to Channel 1. NOTHING should be connected to Channel 2.
  • The Channel 2 level control should be turned all the way down. Turning it up will amplify common-mode noise.
  • The + speaker terminal is connected to the red binding post for Channel 1 and the - speaker terminal is connected to the red binding post for Channel 2. Neither side of the load should be grounded.
  • There are no connections to the black binding posts. They should not be grounded or shorted together.
It does not seem practical to bridge or parallel two MT 1200 boxes; it would be very difficult to get the levels and offsets precisely matched. If they aren't matched, you will get oscillations or common-mode amplification - that is your humming noise.The bridging switch makes six changes to the circuitry to get the amplifiers properly interconnected in one box so this won't happen in the recommended configuration.

Jun 20, 2011 | Crown MT 1200 2-Channel Amplifier

1 Answer

My 8000s has developed a hum which is audible in both speakers. When the amp is first switched on I do not hear it but after about an hours use it becomes apparent. The volume of the hum is constant and...

My first thoughts are to replace the large electrolytic capacitor(s) their will be at least two I think, as they could be getting leaky. Though they could be fully charged up on switch on (hence no noise) they could lose it as time passes and let the 50/60 Hz mains hum in (which they stop). Another cause could be a semi-conductor that has become heat sensitive. This again could be in the power supply or something that has both channels running in and out of it. This is because the noise is in both channels, so can't be something that deals with only one channel, even if there are two of them!
Replace the caps first, if that doesn't solve your problem, then get some Servisol Freezer spray and spray any suspect part (one at a time) when it acts up! If the noise goes you have the culprit.

May 20, 2010 | NAD C372 Amplifier

1 Answer

Home amplifier

Hum is probably due to insufficent grounding somewhere. Make sure coax cables at input are good. Re-locate unit away from aplliances

Apr 12, 2008 | Amplifiers & Preamps

1 Answer

Gemsound power speaker pxa105

Disconnect any input cables from the amp. Turn down the volume controls and disconnect the speakers. Power back on. If you still blow fuses with nothing hooked up, have the amp fixed.
If the fuse holds, shut down and connect the speakers, leaving the volume controls down. Power up and see if your fuse holds. If you have hum, an output transistor is most likely shorted. If you have no noise, SLOWLY turn up the volume controls and listen for the hum. If all is quiet, turn down the volume controls and connect your input cables and turn the volume back up. Noise? check your cables!
Mister Phil

Apr 07, 2008 | NAD C350 2-Channel Amplifier

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