When the amp has been used for a few hours it starts makeing a screaming crackling noise but still works, even with all the volumes turn off, it still makes the noise, could this be a valve? if so how do i tell which one.
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Re: screaming crackling noise when very hot
Crakling sound is a symptom of loose or cold solder in amplifier section where the STK IC or Darlington transistor is located .You better re solder all parts joints there in order the crackling sound is gone.
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Your best way to deal with this issue is to do some "hum tests" inside the unit with it on. Since only one channel is faulty and they are identical, you can use the good channel as comparrison with the bad. You simply touch with you a plastic tool or if you can your finger - not touching metal parts though - and either channel will buzz. Chances are you will come upon the faulty part and make it crackle.
Try connecting another speaker that is known to work to the Rear right connector, and if the crackling noise still appears, it is a problem with your wiring, receiver speaker terminal, receiver internal board, or the device connecting to the amplifier or the wiring from that device to the amp. Usually this is a wiring problem, or faulty crossover.
Need to know if turning down the master volume when it is making the noise stops the noise. If it does, the fault is in the preamp section, if not, it is in the power amp/power supply. Suspects are the power supply electrolytic capacitors.
Hi, it all depends on how many output your amp. has?.
You can check at the back of the amp. (depending on the type and how many output in has). Don't just look at the aux output alone, your main check should be for more outputs. Some amps. have tuner output,cd output,video output and so on. Just connect it to any of this outputs at the back of the amp. and at the front you have to set it to the selected output at the back so that they can correspond which each other.
NOTE: you can't use to output at ones you will have to e interchanging them one by one. Two different out put do not work together, but separately.
There are a few variants for this model depending upon the serial number. From your description, there are some capacitors in between the amp stages called coupling caps that are failing. The hum is some DC current being passed through the output stage. The crackling is probably just dirty controls.
That is a common symptom of not properly grounding of negative side of the output of power amplifier section.Just resolder all component parts joint in power amp.sectiton and double the solder all negative ground.Also clean the pots of all volume controls and selector with a lighter fluid or desame that fluid so whatever sound or crackling noise eliminated and works normal again..
Hope it may help you;;
First thing to check is that the phantom power is not turned on. If you are using a condenser mic, then it should. If you are using dynamic mic, then it will crackle and makes weird noises in the manner you describe. Other than that it sounds like you have a failing op amp in your preamp. This sort of repair work is not expensive(with respect to the outcome). I would anticipate $40-60 to fix it. Trouble is you can replace it super cheap at the moment 45% off for $64.95plus $9.95 shipping from zzsounds
So I guess that it may not be worth repairing, and more a replacement item for that money. If you have a mate with electronics experience, you could just replace the opamps at home for $10 worth of parts.
If you think my advice helped you to work out what to do, a FixYa rating would be great. Cheers