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.?
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.?
hmmm..could be a power supply smoothing cap gone bonkers...check for leaky caps...and make sure your transformer is not humming (mechanically)
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.
If it still plays and sound ok it the transformer.
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??
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
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.
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...
What amp is it? has it always hummed? does it hum with the inputs shorted? Is the hum effected by the volume control? anything...
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...
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
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
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 ?
🙂rich
🙂rich
Thanks Jim and Rich, etc...
It is a Sony Integrated amp
and I will open it up and see what i find.
the only charcter that this noise has is that it is always there.
and what is emi that Jim and 773 refered too??
dw
It is a Sony Integrated amp
and I will open it up and see what i find.
the only charcter that this noise has is that it is always there.
and what is emi that Jim and 773 refered too??
dw
EMI problems are more nasty.......if you don't have a oscilloscope then a portable radio tuned on LW or on lowest MW band will pick up interference near the equipment. A poorman's detector.
This will be in the form of birdy noises, cat whistles and will be obvious hash. If this happens then you have a nasty problem. Put loudpeaker leads near radio and see any difference in radio backgound noise.
If you do hear obvious problems then somewhere in the output stages lies the snags (or dodgy rect diodes I ment'd prev). Or circuit has duff IC. As transistor amps have a response that goes in the RF spectrum, then you have to seriously look at board earthing (screws etc)and condition of all cables, cap bypass etc. In saying this, the radio pick up is very good at picking up instability, bit if your amp has already a SMPS in it then this technigue anin't going to work.
In general, EMI will be present when unit is electrically unstable,
transformer buzzing is mechanical. I suggest disconnect your good speakers and use others while you do these tests, as I there is a serious DC drift due to problems, then you won't regret the loss.
That's about as far we can take it.
My other suggestion is more drastic, ditch the dammned SS amp and find a tube amp which is more reliablei n long term.
VIVA..... tube amps!
🙂rich
This will be in the form of birdy noises, cat whistles and will be obvious hash. If this happens then you have a nasty problem. Put loudpeaker leads near radio and see any difference in radio backgound noise.
If you do hear obvious problems then somewhere in the output stages lies the snags (or dodgy rect diodes I ment'd prev). Or circuit has duff IC. As transistor amps have a response that goes in the RF spectrum, then you have to seriously look at board earthing (screws etc)and condition of all cables, cap bypass etc. In saying this, the radio pick up is very good at picking up instability, bit if your amp has already a SMPS in it then this technigue anin't going to work.
In general, EMI will be present when unit is electrically unstable,
transformer buzzing is mechanical. I suggest disconnect your good speakers and use others while you do these tests, as I there is a serious DC drift due to problems, then you won't regret the loss.
That's about as far we can take it.
My other suggestion is more drastic, ditch the dammned SS amp and find a tube amp which is more reliablei n long term.
VIVA..... tube amps!
🙂rich
ViVa tube amp.... bah!
Anyway I was under the impression that this was a home brew amp, not any longer 😛. Anyway I had a similar problem of buzzing in my amp and this was resolver by relocating the earth wire away from the traffo, it was picking up buzz and the amp buzzed because of it!. Anway I doubt the problem is the same, as im assuming that the amp has, at one time, not buzzed. If this is the case then try the caps. If tho some of the internal wiring is hard wired, not PCB stuff, if an earth wire has moved it could be picking up stray buzz fields 😀.
Anyway I was under the impression that this was a home brew amp, not any longer 😛. Anyway I had a similar problem of buzzing in my amp and this was resolver by relocating the earth wire away from the traffo, it was picking up buzz and the amp buzzed because of it!. Anway I doubt the problem is the same, as im assuming that the amp has, at one time, not buzzed. If this is the case then try the caps. If tho some of the internal wiring is hard wired, not PCB stuff, if an earth wire has moved it could be picking up stray buzz fields 😀.
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