My Aleph30 make noise when it hot !!! - diyAudio
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Old 29th March 2006, 02:01 AM   #1
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Join Date: Nov 2002
Location: montreal
Default My Aleph30 make noise when it hot !!!

Sometime, after an hour or two, my aleph30 make some noise that came from the transformer I think.
I have no hum at all from the speakers.
I maded this amp 2 year ago.
Maybe I have some bad cap ???
Maybe 400VA transformer is not enough ??? But it draw about 2A that mean 250VA at 125V. And, I tried to disconnect 1 channel to draw less amp and the noise still the same.
Or, I am in this appartment since a couple of mounth, can I have big DC offset in the line that can ¨saturate¨the toroidale transformer ???? But, I plug my Aleph30 in serie with an SOLA noise reducer isolator transformer and the noise still here.

Please, I need some help, I have no idea what is the problem.

Thank you !
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Old 29th March 2006, 12:34 PM   #2
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Join Date: Sep 2003
Location: Paris - France
arold19,

1)- Try changing the orientation of the transfo.
2)- Verify cap's on the primary
3)- Verify and adjust the fixation, a little more or less can do the trick
{My NAD C350 started his life with noise after 1 hour also, changing the
orientation and tightening for a while then untightening the fixation screw
did the job}
4)- Change the transfo, if it's a brand see with the provider to replace it.

Alain, near Montreal.
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Old 29th March 2006, 09:12 PM   #3
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Merci Alain, je vais essayer tes conseils.
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Old 30th March 2006, 01:14 PM   #4
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If the noise is a "buzzer" to 50 Hz (or 60 if you are in USA) probably you have to change the trasformer because the coils was too large on the nucleus. It can succeed after some time because the copper coil can loose the original form.
The best solution is a toroidal transfomer with a very good cover in plastic teflon very well tight.

good luck
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Old 23rd April 2006, 02:33 PM   #5
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Join Date: Nov 2002
Location: montreal
Now, the transformer make noise sometime when I turn on the amps. So, it is in trouble sometime cold and sometime hot....

I think Alessandro have right, but what I do ???

I put this transformer in the basket.... and I buy and other one ???
Or maybe Plitron can do something ???
It is not my first problem with Plitron transformer...

Thank you !!!!
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