60 Hz hum on old Bose Wave radio everytime power-up, but sometimes after 5 minutes the hum stops. have tried different power outlets. have tried using power supply noise filter. hum occurs even when playing from AUX input. suggestions please
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one of the most common sources of hum is a failing power supply.
I don't know your radio specifics..... however, some things to consider/try : if it can be battery powered, try it with batteries.
If hum disappears, then source is power supply. Power supply
hums are usually 60 or 120 Hertz (cycles per second). The most
common failure component in power supply, causing a hum, are
the filter capacitors. If you do try to replace these, be very careful
and discharge the old caps before you remove them - to avoid a
(potentially dangerous) shock... caps can retain a charge for many
days, sometimes. Another source of hum is if the radio is close to
a flourescent light, or other appliance which may radiate power. If so,
try moving radio. If the hum is high pitched, then more info is needed.
Hope this helps!
Hum is a constant low-frequency buzz, usually at about 60 Hz or 120 Hz, which results from voltage differences between true "ground" (what you'd get shoving a copper pipe into the ground) and the electrical "ground" of your receiver's chassis When this voltage differential exists, it's called a "ground loop," and the hum it produces is darned annoying. You'll hear the hum mainly from the subwoofer because it's a low-frequency noise, you will need a ground loop insulator they are about $20 at any electronic store
From the sounds of it the microprocessor is scrambled, this can be caused by a power surge or thunderstorm, unplug unit, press and hold power button for 60 seconds in an attempt to clear the processor, if this fails this will be a job for a Bose factory trained technician.
The antenna is built in. The buzz you're hearing is a 60cycle hum (electricity from a nearby appliance) Try this, put an extension cord on it and walk it around your listening room for best reception. You can also find the culprit appliance by turning items off 1 by 1 until buzz subsides.
Need to know is ti a first generation of the bose wave radio or second, could you tell what battery it has?
Also does it have an external AM antenna?
With old radio, first generation, you will need to replaced all capacitors, And I mean ALL. Radio will be good as new.
Unless radio suffered a some kind of liquid damage and then it could be anything.
Good place to repair Bose wave radio in Chicago, Electronic Engineers. 773-202-0909
The hum a fluorescent light makes is the 50 or 60 Hz hum of the alternating current mains supply. Inside the light fitting is a choke which when less than perfect tends to hum. When the choke is loose internally or externally is when the hum becomes an annoying buzz.
When an audio system has a similar tone of buzzing or humming the source will invariably be the same AC mains but how it got in there is difficult to answer...
It could possibly be poor smoothing and regulation of the power supply or an accidental hum loop caused by careless design and/or poor grounding. It could be caused by being induced in the input by connecting leads that are too long and poorly positioned/screened or it could be caused by mismatch between different components causing a poor signal-to-noise-ratio.
I am not sure why it should come and go but the fact it does would indicate a power supply problem more than the other possible causes.
If the Onkyo system has it's own volume control and it is being used witha tv or similar, it is worth trying to imporove things by turning up the tv volume to near maximum and then controlling the volume with the system control.