View Full Version : Electricity supply - Isoplug???
25-09-2003, 09:34 AM
Morning All ,
My Pioneer was emitting a hum from the transformer. Originally I though it was a fault with the unit and swapped it.
I have since been told (as the new unit is doing it also) that it is to do with the electricity supply coming into the house.
It's definatley not an earth loop, it's more mechanical, i.e. transformer hum from the unit.
Apparantley, the transformer is made up of separate layers of metal laminated together. and it is these that vibrate.
A friend has recommended the Isoplug!!!
I just wondered if anyone else has bought one of these and could share theri thoughts.
Thanx in advance.
25-09-2003, 09:38 AM
I have one, it's plugged in right next to my AV system. Personally I think they do make a difference. I also use 2 of Russ Andrews' Silencers and if I unplug them all you can clearly see the effects on things like Sky TV picture quality. Whether it has such a dramatic effect on sound quality I don't know, but all the objective evidence suggests they do actually do what they're claimed to do.
The ambient noise floor in most people's homes probably renders them less effective than the stats prove though.
25-09-2003, 09:46 AM
You say the hum is more mechanical than electrical. It may be that using an Isoplug or the Russ Andrews Silencer may help with this if your mains is spectacularly dirty, but your problem just sounds like plain transformer hum. :(
By all means try borrowing an Isoplug and see if it helps before buying, but I would be tempted to try getting hold of some 'cones' and try positioning these carefully under the amp to try and decouple the hum. I used to have a Counterpoint SA100 power amp, which was a wonderful-sounding beast except the transformer used to hum like yours. By positioning three cones to support the amp, two front, one at the back to avoid the thing rocking, I then placed a fourth adjustable cone directly under the transformer and by adjusting the height of this carefully so it just pushed into the base plate of the amp without disturbing the balance, I found I could almost silence the transformer noise. Worth a try. ;)~;-)~:wink:
25-09-2003, 12:27 PM
Cheers for that Slarty :thumbup:
Can you recommend a decent place to get these 'cones' please.
Thanx in advance.
25-09-2003, 01:06 PM
These (http://www.springair.org/index.html?d_8907_Audio_Selection_Cones_Geratefuse 24857.htm) were the ones I used, which I got from my local hifi dealer. I'm sure you could get something cheaper if you shopped around. I would try and find a friendly local hifi dealer who would lend you a set to try before parting with any money as they may not necessarily fix your problem anyway. ;)~;-)~:wink:
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