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Old 25th November 2003, 03:54 PM   #1
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Unhappy amplifier noise

Hello,
I have a simple question on a buzzing noise i get from my 6 ch amp. there is this annoying hum or buzz on all channels, sounds like transformer buzzing. is something hooked up wrong or is something wrong with my amp. ?
any ideas.?
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Old 25th November 2003, 11:44 PM   #2
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hmmm..could be a power supply smoothing cap gone bonkers...check for leaky caps...and make sure your transformer is not humming (mechanically)
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Old 25th November 2003, 11:58 PM   #3
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Sometime when transformers get hot and under a load the winding can start buzzing. The winding can become lose over time and buzz. A bad cap will make a nasty sound.
If it still plays and sound ok it the transformer.
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Old 26th November 2003, 12:09 AM   #4
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I was thinking just about the same thing...except that when the cap is just starting to go leaky..does it get worse?? after a prolonged period of playing?? and what amp is that??
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Old 26th November 2003, 03:52 PM   #5
name773 is offline name773  United States
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in one of my amps the el-eye transformer is just to the left of the output stage without shielding, and it does the same thing. maybe it's just emi getting to the other amp internals
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Old 26th November 2003, 05:58 PM   #6
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The emi is normally HF and when the windings are buzzing is closer to 60 Hz. The emi may or may not effect the sound quality and that depend on many factors.
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Old 26th November 2003, 06:47 PM   #7
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Don Ward, it might help if you can provide more information in order to reduce the guesswork.

What amp is it? has it always hummed? does it hum with the inputs shorted? Is the hum effected by the volume control? anything...
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Old 27th November 2003, 01:48 AM   #8
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he hasn't replied since his first post...might be a bad decoupling cap somewhere...check for obvious leaks...and test the high resistance resistors...
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Old 1st December 2003, 01:34 PM   #9
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Default amp noise

Hello, i have been unable to reply the last few days but here I am,
I apreciate your suggestions and will check the cap and windings and see what happens when the inputs are shorted. ??
the humm isnt affected by the volume pot, it is always there and the audio is fine when i turn it up but the buzzz is still there behind it. ( you can here it when there is no other sound).
thanks. dw
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Old 1st December 2003, 07:39 PM   #10
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Takes ze lid off and carefully peruse the internals. Locate rectifier system and see if made of discrete diodes, check components for discolouring from overheating.. They could be on their way out leading to a catas'ic failure. As per previous suggestions..A buzzing transformer will always change it's pitch when put under pressure..If you say "all channels" then seems more a electrial problem. Dodgy fuses, input sock and so on. Did you spill beer on it ?
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