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Old 1st June 2015, 07:20 PM   #1
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Default Silent Transformers in Europe

Hi,

after having tried a lot of things (DC-Filters, other Filters, PS-Audio Power Plants, less current , mechanical isolation etc. ) without success I think it is time to buy a new set of transformers for my pair of Aleph-x Amps because they are just too noisy (mechanical hum). I can hear them from 3 meters away (no music playing), the level changing depending on what comes in through the mains.

I´ve tried quite a few transformers in different (class-A) amps. They were from Amplimo, Tauscher, Schuro. Most of them were potted and vacuum filled with some sort of resin. All were around 500-600VA.
All of them made more or less noise induced by the not so perfect mains here in Ingolstadt.

Since it seems to be possible to put silent transformers in class A amps (see the Pass Labs products) maybe someone knows where to buy transformers like that in Europe or even Germany.

So if somebody knows please tell....

thanks,

William
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Old 1st June 2015, 07:49 PM   #2
6L6 is offline 6L6  United States
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Quote:
Originally Posted by wuffwaff View Post
Since it seems to be possible to put silent transformers in class A amps (see the Pass Labs products)
When I took a tour of Pass Labs last year, I was surprised at the pile of rejected transformers. Those were the humming ones, and not placed in a customer's product.

It's not just you having problems with humming transformers, I would say that 1/3 - 1/2 of the one's I've used hum.
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Old 1st June 2015, 08:06 PM   #3
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there is a lot of humming transformers. i've been Lucky. i have never had any hum problems in my builds. wel. not at the transformers foult at least
i guess the mains are to thank for that. i have always used ordinary open transformers. wiring have a lot to say ofcourse.

Last edited by AudioSan; 1st June 2015 at 08:10 PM.
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Old 1st June 2015, 08:23 PM   #4
Bensen is offline Bensen  Belgium
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Hi William,

I'm using 2 500VA R-cores from in my last setup. An other amp next to it with a 650VA Amplimo toroidal is clearly more noisy. Have no idea whether a R-core is inherent more silent?

R-CORE pour châssis - Transformateurs - Composants électriques - Sommaire

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Old 1st June 2015, 08:24 PM   #5
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Either use none toroidal transformers or convert to SMPS.
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Old 1st June 2015, 08:40 PM   #6
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Originally Posted by Bensen View Post
Hi William,

I'm using 2 500VA R-cores from in my last setup. An other amp next to it with a 650VA Amplimo toroidal is clearly more noisy. Have no idea whether a R-core is inherent more silent?

R-CORE pour châssis - Transformateurs - Composants électriques - Sommaire

Cheers
Hi,

looks interesting. The 300VA 2x18V could even fit. At the moment the Aleph-X uses around 150Watts as I already reduced the bias to keep the noise down (still enough to power ca. 100dB/watt speakers.

Would a 300VA be enough for a constant 150Watt load?

william
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Old 1st June 2015, 08:41 PM   #7
CeeVee is offline CeeVee  Portugal
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Well Dc is one of the culprits but... i have no complaints and i use Toroidy audio transformers from Poland.....try them!

Audio - TOROIDY.PL Transformatory Toroidalne Producent, Audio, Separacyjne, Trójfazowe, 230/110V, 110/230V, Na zamówienie

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Old 1st June 2015, 08:47 PM   #8
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Originally Posted by nigelwright7557 View Post
Either use none toroidal transformers or convert to SMPS.
Hi Nigel,

yes, the SMPS in my N-Cores are silent. Not sure how easy it would be to change to SMPS. Building one is a lot more difficult as a simple linear C-L-C supply.

Never saw a class-A amp with an SMPS, is there a reason for this?

William
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Old 1st June 2015, 09:09 PM   #9
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Well Dc is one of the culprits but... i have no complaints and i use Toroidy audio transformers from Poland.....try them!

Audio - TOROIDY.PL Transformatory Toroidalne Producent, Audio, Separacyjne, Trójfazowe, 230/110V, 110/230V, Na zamówienie

Hi CeeVee,

their Website looks interesting.

Thanks!

William
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Old 1st June 2015, 09:34 PM   #10
CeeVee is offline CeeVee  Portugal
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Originally Posted by wuffwaff View Post
Hi CeeVee,

their Website looks interesting.

Thanks!

William
...my pleasure , you might like to know that EUVL uses them exclusively and he is very criterious in his choices :-).


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