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Old 2nd April 2006, 02:00 PM   #1
Bonsai is offline Bonsai  Taiwan
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Angry Big Torroidal - Noisy

Hope someone can help here. I have a new 1KVA transformer for an amp I am building (from RS componenents). I though torroids were supposeed to be quiet - this thing buzzes along and if definelty too noisy to use - even when I lift it off the bench or put it on some foam rubber. Anyone got any expereince with these things? Do I have to spend 50 and still pot the whole thing up?

Comments/experiences welcome

Thanks
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Old 2nd April 2006, 02:16 PM   #2
lndm is offline lndm  Australia
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AFAIK toroids are typically quiet. Are you sure you don't have some windings bucking?
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Old 2nd April 2006, 02:23 PM   #3
Netlist is offline Netlist  Belgium
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Even unloaded?

/Hugo
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Old 2nd April 2006, 02:30 PM   #4
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Quote:
Are you sure you don't have some windings bucking?
When you say "bucking", what does that mean? Curious minds want to know.
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Old 2nd April 2006, 03:22 PM   #5
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Default Hi

ACR wrote
Quote:
Hope someone can help here. I have a new 1KVA transformer for an amp I am building (from RS componenents). I though torroids were supposeed to be quiet - this thing buzzes along and if definelty too noisy to use - even when I lift it off the bench or put it on some foam rubber. Anyone got any expereince with these things? Do I have to spend 50 and still pot the whole thing up?
Your problem is unfortunately a common problem when using standard transformers in audio application. It is a big chance when buying those transformers made for the industrial use (very cheap) and then try to implement it into audio amps. They nearly always buzzes, hummmmsss
and noises. There have been written a lot of articles about this issue but you could start looking at Pliton transformers an their link:
http://www.plitron.com/pages/lono.htm

Make a special attention to the article: Measuring Acoustic Noise Emitted by Power Transformers
further down at this page.

If taking account to the problem, transformers built for audio applications are never cheap.

This is why I started and tried a GB for a solid state amp transformer from Avel Lindberg (former supplier to Krell). I have specified the application to be for Audion use (noise reduction is the primary issue here).

Hope this helps a little but its another issue to get your transformer to be silent( impossible if you ask me)

Regards
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Old 2nd April 2006, 03:35 PM   #6
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Default ACR

I forgot to tell you that the best thing to do is to send this transformer back to RS and claim a guarantee issue.

If you are lucky you could get one that is quieter than this one, or you could make a decision to choose another type of toroids if RS approves a guarantee.

Regards
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Old 2nd April 2006, 04:10 PM   #7
djk is offline djk
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The Bryston solution. Try before returning your transformer and buying a more expensive design.

http://www.diyaudio.com/forums/attac...?postid=328821
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Old 2nd April 2006, 04:13 PM   #8
tubee is offline tubee  Netherlands
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I have a hybrid amp, tube voltage stage and TO3 powerfets. First i tried little 50VA toroid-transformers for the fets, they where impregnated.
Later with improving my amp i ordered two Amplimo 120VA Toroids.
But after a few weeks of class a duty, they began to hum mechanically!

I informed at the manufacturer two times, but never heard anything back!

A smaller Amplimo toroid in my tube preamplified is quiet though.

A solution for this is to get special clear self drying impregnating fluid from a transformer fabric and impregnate yourself. There exists vacuum impregnating fluids also, sort of thermohardening resin.
I worked very close to a transformer firm, so i know a little how they did and what products they used.

But i never buy an Amplimo transformer again.
In germany (at Schuro.de) i can get other makes cheaper and better, impregnated!
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Old 2nd April 2006, 04:23 PM   #9
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Only yesterday in read in the german hifi-forum that toroids were pretty succeptible to noise from the supply-net ( hope you know what I mean) and then tend to humm.
Som, either look for the problem in your supply lines, try to filter the noise just before the toroid or you can fill it will resin (it isn't filled yet, is it?) to make it stiffer, less prone to vibration.

Cheers,
Dominique
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Old 2nd April 2006, 04:36 PM   #10
tubee is offline tubee  Netherlands
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I mounted some diy ferrite in series with the mains connections. Maybe they induce noise also. The humming is not always the same. Warm toroids are noisier (looser windings due to warmth)
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