RE: Humming amps :(

["Keith Doxey" <ukha@xxxxxxx>]

Hi Tony,

It sounds as if the PSU smoothing capacitors have dried up with threee
years
of cooking.

Is the hum still present if the ONLY thing physically connected to the amp
is the speaker?

If its OK with only the speakers connected but hums as soon as an input is
connected then somehow you have created a ground loop.

HTH

Keith

www.diyha.co.uk
www.kat5.tv


> -----Original Message-----
> From: Tony Butler [mailto:lists@xxxxxxx]
> Sent: 12 July 2003 10:05
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Humming amps :(
>
>
> Hi kids,
>
> Was on hols recently whilst workmen finished off kitchen.
> When I came back, one of my multi room amp (a Parasound Zamp) was
> humming (well okay, the speakers were humming, but the source is the
> amp) when switched on.
> Dunno if workmen had tried to play with kit and had amps on but knekt
> system feeding it off, or if the build up of heat in the cupboard
> knobbled it....
> Anyway, luckily I had a "spare", recently returned from
holidays in
> Phils house, so I swapped em out and all was well again.
>
> HOWEVER, yesterday SWMBO noticed no sound in the dining room and on
> investigation, the feed to that zone from the Knekt Intersekt
> had become
> disconnected when I was fiddling about in N0 recently.  So
> SWMBO had the
> zone on with nowt feeding to it.
> Plugged it all back in this morning and....this amp is
> humming now.....
> Again, has been hot recently so maybe.....but definitely amp has been
> on, volume up, no signal feeding it - so I'm wondering if this has
> buggered anything?
> After all, amps have been in same cupboard, on 24/7 for 3 yrs now
> without incident.
>
> Music does still play thru amp, but with it on and source feed off,
> loud(ish) annoying hum issues forth :(
>
> Can anyone suggest something simple it might be that a man of limited
> skillz such as myself might try?  Or alternatively, do you know of
> somewhere Croydon-ish that repairs amps without charging an arm and a
> leg?
>
> Cheers,
>
>
> Tony.
>
>
>
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