Help me fix this "buzz"?

Decker · 19th February 2013, 05:32 PM

Here is a problem that I haven't run across before. I have a Reckhorn B-1 bass control box that is producing a "buzzing" noise through the speakers. I did not notice this noise when the device was new. The box is small and tightly packed. Because the noise is in both speakers, I suspect a power supply problem. The PS is a standard EI core transformer to a bridge rectifier to (2) 2200 uf, 16 v caps to 7812/7912 regulators. All tightly packed together, with the caps right next to the transformer. If I push down on or grasp the PS caps, the "buzz" disappears, leaving a low level hum, much fainter than the buzz. So what is going on? Are the caps damaged? Is the transformer coupling noise through the caps? I am thinking of replacing the caps and mounting the transformer in a separate box, but I would like to hear any ideas from my homies before I start tearing things out.

Decker · 19th February 2013, 07:00 PM

bump

19th February 2013, 05:32 PM	#1
Decker diyAudio Member Join Date: Jun 2004 Location: San Francisco	Help me fix this "buzz"? Here is a problem that I haven't run across before. I have a Reckhorn B-1 bass control box that is producing a "buzzing" noise through the speakers. I did not notice this noise when the device was new. The box is small and tightly packed. Because the noise is in both speakers, I suspect a power supply problem. The PS is a standard EI core transformer to a bridge rectifier to (2) 2200 uf, 16 v caps to 7812/7912 regulators. All tightly packed together, with the caps right next to the transformer. If I push down on or grasp the PS caps, the "buzz" disappears, leaving a low level hum, much fainter than the buzz. So what is going on? Are the caps damaged? Is the transformer coupling noise through the caps? I am thinking of replacing the caps and mounting the transformer in a separate box, but I would like to hear any ideas from my homies before I start tearing things out.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Denon PMA-520 Integrated Amp "Buzz"	DreadPirate	Solid State	9	19th September 2017 04:07 PM
need help to fix the "hiss" on my tube preamp	Angelpat	Tubes / Valves	29	17th August 2012 08:38 AM
Line level SE to differential "fix-it" box	Iain McNeill	The Lounge	0	15th January 2010 05:09 AM
Help needed: How do I fix a "pushed in" dust cap?	pk	Multi-Way	14	19th March 2009 12:27 AM
How to "fix up" these speakers?	lurer	Multi-Way	3	18th July 2007 06:34 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

19th February 2013, 07:00 PM	#2
Decker diyAudio Member Join Date: Jun 2004 Location: San Francisco	bump