Crescendo power supply

poelieke · 14th January 2010, 02:09 PM

I have build the crescendo about 15 years ago, i havent used it very much because the transformer is humming very loud as the amplifier is about 2 min in use. I have used an Amplimo 1200VA ring core transformer.
Has anyone a similar experience, and what to do about it?

Corax · 11th February 2010, 03:00 PM

That sounds like a bad GND wiring scheme. Somewhere you might have a GND-loop which causes this phenomena.
Disconnect all inputs and short them to GND. Is the hum still present/audible? Then it's in your amplifier. Post pictures from inside and make a detailed scheme on how you have wired the GND-cables. Then we might be able to help you.

14th January 2010, 02:09 PM	#1
poelieke diyAudio Member Join Date: Jan 2010	Crescendo power supply I have build the crescendo about 15 years ago, i havent used it very much because the transformer is humming very loud as the amplifier is about 2 min in use. I have used an Amplimo 1200VA ring core transformer. Has anyone a similar experience, and what to do about it?

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11th February 2010, 03:00 PM	#2
Corax diyAudio Member Join Date: Feb 2005 Location: south of lower saxon	That sounds like a bad GND wiring scheme. Somewhere you might have a GND-loop which causes this phenomena. Disconnect all inputs and short them to GND. Is the hum still present/audible? Then it's in your amplifier. Post pictures from inside and make a detailed scheme on how you have wired the GND-cables. Then we might be able to help you.

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