Right speaker has a humming noise in it. Hum increases with increased volume. If you switch speakers (L to R), then the speaker that was L (now R) has the hum; so, the hum source is not in the speaker, but in the console.
No apparent hum if you're listening to the radio, only when listening to CDs.
Bad capacitor? anything I can try without opening the console housing?
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If the hum is a low note continuous hum, its at 'mains' frequency. The power cables to the unit (or inside it) are getting too close to the cables that carry sound signals to the center speaker. The mains power naturally hums and if mains wires are near to audio kit wires they pick up this sound and play it through their system/speakers. Check the wires to and from it make sure the connections are good and firm. Seperate these wires by at least one inch from any power cables, use tape to hold them down and away from each other.
Did you swap speaker to a different channel and put another in its place to see if the problem follows the speaker or stays on that channel? That would me my next move if it's possible to do. Let me know.
this old timer probably has an output amplifier fault.with a circuit diagram any competent engineer shoulb able to locate the problem with the turntable removed access is easy and so is replacing parts
Well...as you said...the unit powers up...so you don't have a "dead set".I don't know if the speaker can be disconnected from the unit.As a rule of thumb...it is very rare that both channels (left and right )fail at the same time...it is usually one channel while the other speaker still operates.This is what I want you to do...In a quiet room..get really close to the unit...Switch it on and listen for any sound from the speakers...get really close...you should hear a slight hum from the woofers and a high frequency "hiss" from the tweeters....If no sound is heard..switch the unit off..You should hear a "plip" sound...If not...switch it on again...you should hear a slight "bump" sound from the woofers...If you hear no sound from the speakers at all..there is a problem with the output stages of the amplifier section.If you do hear sounds fron the speakers,,Turn up the volume and watch for an increase visually on the display (such as ascending numbers).If there is no indication of a volume increase...The "mute" may be stuck on..Try switching it off and on...please let me know what happens after you do all the tests....Looking to hear from you......PEACE!!! ok...
(1) Is the hum out of both speakers?? (2) Is the sound distorted out of any of the speakers?? If the answer is yes to 1 and no to 2 then it sounds like one of the smoothing blocks or capacitors have gone down and requires replacement. If no to 1 then you probably have blown the output chip or taken one side of it out, check all connections to the speakers, try not to use tape joints which are unreliable. If you do have to piece the cable, solder the connections. Then replace the chip, Ian
The hum therefore is a generated before it reaches the volume control. Check that all the connects are good, a bad earth will cause a hum. If the hum is in both channels it will be something that is common to both. Electrolytic Capacitors are there to take out hum, so suspect them first!
It is assumed that the hum is coming down the aerial wire it self....The hum should be eliminated
dissappear if you remove the wire from its connector at the rear of the receiver.
If this is the case then reconnect the aerial and try to find a radio station to listen to..
When you find a station you will find the hum dissappears as follows:
When there is no station detected the receiver tweaks up its sensitivity via the Automatic Gain Control, (AGC) and when this happens any thing that is detected on the aerial is reproduced at the speakers and in your case its just a hum.
I have heard this event lots of times and mostly its scrackles or scratchs or other weird sounds which come down the aerial while the AGC is flat out at maximum..
The radio station transmits a sound "carrier" and within this carrier there is the music content.
The receiver detects the "carrier" when you tune to the radio station, and then it sets its receive
level to the setting made by the volume control and then lovely music is presented at the speakers..
So in fact your receiver is working as it should be ,.,,, no worries mate....
Now if the hum is still there when the music is there then you have a fault, but as you havent mentiond this aspect your receiver is in my view quite "normal".