Systemic Development > Amplification and Preamplification
Power supply help please...
Barry (NJ):
So, I love my Audio Alchemy OM-150 amplifiers, but there is a small problem, hum/buzz. The power supplies have a mechanical hum/buzz that makes its way to the speakers. I was wondering if I could add a filter of some type, to the DC after the rectifier, to prevent this transmission. The power supply looks extremely simple, and there is 93.5V DC coming out of the bridge rectifier diode. There is a good amount of room on the other side of the transformer, about 4" x 4" x 3", for capacitors and such, if needed. Thanks for any input and guidance.
Audio Alchemy PSU150 by Barry, on Flickr
HAL:
If you are hearing hum/buzz in the speakers, most likely it is the power supply caps are drying out and need replacing.
A good person to ask is Dusty Vawter at CI Audio as he was at Audio Alchemy when they were made.
Good luck.
Folsom:
The DC side is not where I'd be looking.
Try a HumX first.
Barry (NJ):
--- Quote from: HAL on February 10, 2021, 05:26:46 PM ---If you are hearing hum/buzz in the speakers, most likely it is the power supply caps are drying out and need replacing.
A good person to ask is Dusty Vawter at CI Audio as he was at Audio Alchemy when they were made.
Good luck.
--- End quote ---
Dusty wasn't really involved with the amps, I'd traded emails with him some time ago on it, and I had the caps replaced in one of the amps a few years ago by a local technician, sadly it didn't help.
--- Quote from: Folsom on February 11, 2021, 09:59:10 AM ---The DC side is not where I'd be looking.
Try a HumX first.
--- End quote ---
Between the amp and wall I've tried similar from AVA, a Belkin Power Conditioner, even floating the ground on the power cable, and none were effective. I've also run an uninterrupted dedicated line from the main box to my equipment. The sound is definitely coming from the transformers, it is clearly audible when you're very near the amps, and the same can be heard near the speakers.
Folsom:
In that cause you have to stop it from vibrating, perhaps with rubber footers. Otherwise replace the transformer.
Forget about a filter to get rid of it, won't work.
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